21. If I ………..a camera, I would have taken some pictures.

a. have                  b. had                   c. would have                 d. had had.

22. You won’t pass the examination……………you study more.

a. as long as           b. unless               c. if                                 d. whether.

23. If only I …………you wanted to invest money in business.

a. had known                  b. knew                 c. have known       d. know.

24. If I were to leave my country, I ……………disappointed.

a. probably be        b. would have been          c. will be               d. would be.

25. If he hadn’t wasted too much time, he…………….in his examination.

a. would fail b. wouldn’t fail               c. wouldn’t have failed.   d. won’t fail.