21.Father promised(答應) ____ _a new pair of glasses for me.

　　A.buy

　　B.bought

　　C.to buy

　　D.buying

　　22.The policeman asked the boys ____ there.

　　A.dont stay

　　B.didnt stay

　　C.not to stay

　　D.to never stay

　　23.Its very difficult ____ the old woman ____ skate.

　　A.of; do

　　B.to; make

　　C.for; to

　　D.by; on

　　24.Mr Brown was ____ for half an hour before dinner.

　　A.too tired to lay down

　　B.very tired so he lain down

　　C.enough tired to lie down

　　D.so tired that he lay down

　　25.Grandma couldnt keep up with me and I had to stop ____ her.

　　A.to wait for

　　B.waiting for

　　C.to waiting

　　D.waited

　　26.Please give me some paper ____ .

　　A.to write

　　B.to write on

　　C.to write in

　　D.write with it

　　27.____ English well is not easy.

　　A.To learning

　　B.To learn

　　C.Learn

　　D.For learning

　　28.His wife is all right again. He has nothing ____.

　　A.worry about

　　B.worried about

　　C.to worry about

　　D.worring about

　　29.When he was a child， he tried to find ways ____ people ____ life more.

　　A.to help; enjoy

　　B.help; to enjoy

　　C.help; enjoying

　　D.to be helped; to enjoy

　　30.Zhou Hua was the ____ the classroom.

　　A.second to leave

　　B.second leaving

　　C.two to leave

　　D.second leave

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　　21.C.promise to do sth.答應做某事。 promise后接不定式做賓語。

　　22.C.ask sb. to do sth.請(讓)某人做某事。不定式的否定形式是在 to前加not，即：ask sb. not to do sth.

　　23.C.for和of都可接名詞或代詞做不定式的邏輯主語。用for或of取決于表語形容詞。形容詞若描述的是全句，則用for;若描述的是邏輯主語的特征、狀態，則應用of.

　　24.D.A項語法上能說得通，但語義、邏輯上說不通，人不可能累得躺不下了。B，C的表達都有問題。

　　25.A.stop to wait表示停下來等。如用 stop waiting則表示停止等待，與句意不符。

　　26.B.在紙上寫字應為write on paper，故 to write不定式修飾 paper后面要帶 on，另外，write paper 也說不通，因write 在此作不及物動詞。

　　27.B.to learn English well是不定式短語作主語。另外，動名詞也可作主語，此句主語也可用 learning English well作主語。

　　28.C.to worry about作 nothing的定語，注意不要漏掉介詞about.

　　29.A.to help people也是不定式作定語，修飾 ways. B、 C、 D 三項在結構形式上都有問題。

　　30.A.序數詞后面可接to不定式作定語，而不能用-ing形式。

　　21.Father promised(答應) ____ _a new pair of glasses for me.

　　A.buy

　　B.bought

　　C.to buy

　　D.buying

　　22.The policeman asked the boys ____ there.

　　A.dont stay

　　B.didnt stay

　　C.not to stay

　　D.to never stay

　　23.Its very difficult ____ the old woman ____ skate.

　　A.of; do

　　B.to; make

　　C.for; to

　　D.by; on

　　24.Mr Brown was ____ for half an hour before dinner.

　　A.too tired to lay down

　　B.very tired so he lain down

　　C.enough tired to lie down

　　D.so tired that he lay down

　　25.Grandma couldnt keep up with me and I had to stop ____ her.

　　A.to wait for

　　B.waiting for

　　C.to waiting

　　D.waited

　　26.Please give me some paper ____ .

　　A.to write

　　B.to write on

　　C.to write in

　　D.write with it

　　27.____ English well is not easy.

　　A.To learning

　　B.To learn

　　C.Learn

　　D.For learning

　　28.His wife is all right again. He has nothing ____.

　　A.worry about

　　B.worried about

　　C.to worry about

　　D.worring about

　　29.When he was a child， he tried to find ways ____ people ____ life more.

　　A.to help; enjoy

　　B.help; to enjoy

　　C.help; enjoying

　　D.to be helped; to enjoy

　　30.Zhou Hua was the ____ the classroom.

　　A.second to leave

　　B.second leaving

　　C.two to leave

　　D.second leave

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　　21.C.promise to do sth.答應做某事。 promise后接不定式做賓語。

　　22.C.ask sb. to do sth.請(讓)某人做某事。不定式的否定形式是在 to前加not，即：ask sb. not to do sth.

　　23.C.for和of都可接名詞或代詞做不定式的邏輯主語。用for或of取決于表語形容詞。形容詞若描述的是全句，則用for;若描述的是邏輯主語的特征、狀態，則應用of.

　　24.D.A項語法上能說得通，但語義、邏輯上說不通，人不可能累得躺不下了。B，C的表達都有問題。

　　25.A.stop to wait表示停下來等。如用 stop waiting則表示停止等待，與句意不符。

　　26.B.在紙上寫字應為write on paper，故 to write不定式修飾 paper后面要帶 on，另外，write paper 也說不通，因write 在此作不及物動詞。

　　27.B.to learn English well是不定式短語作主語。另外，動名詞也可作主語，此句主語也可用 learning English well作主語。

　　28.C.to worry about作 nothing的定語，注意不要漏掉介詞about.

　　29.A.to help people也是不定式作定語，修飾 ways. B、 C、 D 三項在結構形式上都有問題。

　　30.A.序數詞后面可接to不定式作定語，而不能用-ing形式。