Điền từ thích hợp, hoàn thành câu

18. If I had known you were in hospital, I …………to see you.

a. will go               b. would go                 c. went                                    d. would have gone.

19. If I …………., I would have said hello.

a. had seen                        b. see                           c. saw                          d. would see.

20. I…………..out if I hadn’t been so tired.

a. will go               b. went                                    c. would have gone                 d. would go.

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.