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3.one is never too old ____ .

  A learning  B.learn  C.to have learned  D.to learn

4.you are old enough _____out alone

a.going     b.go    c. to go   d.to have gone

5.i'm very glad ___you

a.to meet   b.meet    c. meeting     d.to be meeting

6.it's nice ____ you

a.to know   b.know   c.knowing    d.to be knowing

7.you have no ringht ______my daughter

a.see   b.to see   c.seeing   d.to have seen

8.please tell me what____

a.doing   b. do    c.to do    d.to have done

9.i forbid you ____my letter

a.to read   b.read   c.to have read   d.reading

10.we stopped ____ hello to her

a. say   b.saying   c.to have said   d.to say

11. we came___help her

a.help   b.to help   c.to have helped   d.lelping

12.i'll invite her ____my daughter 

a.teaching   b.teach   c.to teach   d.to have taught

13.i don't feel like___to the cinema now

a.go   b.going   c.to go   d.to have gone

14.it's no good___video games

a. play   b. to have played   c. to play   d.playing

15. it's no use___with him

a.working   b.work   c.to work   d.to have worked

16.the idea of____abroad appeals to me

a.working   b.work    c.to work   d.being working

17.the Rogers are happy about___a baby

a.have   b.having   c.to have   d.to be having

18.Camping is hard  if you're not used to____on the ground

a.be sleept   b.to be sleeping   c.sleeping   d.sleeping

19.mrs.Kerry didn't want ____on

a.to be operated   b.being operated   c.to operate    d.to be operating

20.windows are used to let in light and____out cold

a.to keep   b.keep   c.keeping   d.for keeping