26.―Have you decided to tell Dad about the truth？

―If he asks me,I 　　　　him about it.

A.tell           B.told           C.have told       D.will tell

25.―Did you meet Mary when you were in London？

―No.If I 　　　　 she was there,I would have visited her.

A.know         B.knew          C.had known     D.would know

24.It was my mother　　　　 taught me to be curious about nature.

A.who          B.which         C.why           D.whose

23.I　　　　 at the meeting five minutes late，so I walked in and sat down quietly.

A.turned up      B.laid off        C.made out       D.put on

22.Mr. Smith encouraged his students 　　　　 more in and after class.

A.speak         B.speaking       C.spoke         D.to speak

21.We need to thank the great men of the past 　　　　 they left us the scientific ways of learning.

A.when         B.because        C.if            D.though

20.I still remember some of the opinions 　　　　by my teacher Mr. Jenkins.

A.give          B.gave          C.given         D.giving

19.　　　　nobody at home,she decided to leave them a note.

A.See          B.Saw           C.Seen          D.Seeing

18.　　　　more time,we can do it much better next time.

A.Give         B.Giving         C.Given         D.To give

17.―Could you tell me　　　　 we set off？

―At seven o'clock.

A.where        B.when          C.who           D.whether