31. The train ______ half an hour ago. A. has been leavingB. leftC. has leftD. had left 32.The number of competitors who take part in the Olympic Games increases every year. A. participate in B. happen C. take place D. accept 33. Jim_______ to his girlfriend on the phone when I_______ in. A. talked / came B. talked / was coming C. was talking / was coming D. was talking / came 34. Mary is a humorous girl. She always makes me……….. A. laughed B. to laugh C. laughing D. Laugh 35.Christopher Columbus _________ American more than 500 years ago. A. discoveredB. has discovered C. had discovered D. had been discovering 36.If you only care about your interests and feelings, you are very ---------------------. A loyalB friendlyC selfishD happy 37.Each nation has many people who__________ take care of others. A. volunteeredB.voluntarilyC. volunteersD. voluntary 38.Teenagers nowadays often have their own __________ who they really love and imitate in different ways. A. idolB.singerC.personD.crush 39. The wedding party _______ held at the Rex Hotel now. A. isB. is beingC. will beD. is going to be 40.The doctor advised _______ late. A. me not staying up B. me not stay up C. me not to stay up D. I did not stay up 41.Where is Mary? – She _________ for the dinner in the kitchen at the present. A. preparesB. preparedC. is preparingD. has prepared 42. Since _______, I have heard nothing from him. A. he had left B. he leftC. he has leftD. he was left III. Put the words in the correct Tenses:(1đ) 1.After he (have)…………………….breakfast, he went to work yesterday. 2. Don’t waste her time …………………….(complain) about her salary. 3. My car needs (repair)………………………………. 4.I saw the thief (steal) ………………………..the bycicle.