18. In order to pass the graduation exams, he began to (      ) his lessons every day.

  A. read over                                    B. go over

  C. look up                                D. look through

19. He knows little of maths (      ) of chemistry.

  A. and still more                       B. no less than

  C. no more than                        D. and still less

20. She hasn’t got married. She’s still (      )

  A. by herself                            B. single

  C. lonely                                  D. alone

21. You shouldn’t (      ) your opinions on others.

  A. make                            B. strike

  C. force                            D. impress

22. He works hard and he is honest and modest,(      ) he is a good comrade.

  A. after all                         B. above all

  C. in a word                             D. in other words

23. I don’t know how you (      ) the severe winters in your part of the world.