21.Father promised(答应) ____ _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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参考答案
21.C.promise to do sth.答应做某事。 promise后接不定式做宾语。
22.C.ask sb. to do sth.请(让)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都可接名词或代词做不定式的逻辑主语。用for或of取决于表语形容词。形容词若描述的是全句，则用for;若描述的是逻辑主语的特征、状态，则应用of.
24.D.A项语法上能说得通，但语义、逻辑上说不通，人不可能累得躺不下了。B，C的表达都有问题。
25.A.stop to wait表示停下来等。如用 stop waiting则表示停止等待，与句意不符。
26.B.在纸上写字应为write on paper，故 to write不定式修饰 paper后面要带 on，另外，write paper 也说不通，因write 在此作不及物动词。
27.B.to learn English well是不定式短语作主语。另外，动名词也可作主语，此句主语也可用 learning English well作主语。
28.C.to worry about作 nothing的定语，注意不要漏掉介词about.
29.A.to help people也是不定式作定语，修饰 ways. B、 C、 D 三项在结构形式上都有问题。
30.A.序数词后面可接to不定式作定语，而不能用-ing形式。