4. Oil________ if you pour it on water a. floated b. floats c. will be floated d. float 5. When he returned home, he found the door________. a. unlocking b. unlocked c. to be unlocked d. have unlocked 6. That dancing club________ north of the city a. lays b. lies c. locates d. lain 7. Almost everyone________ for home by the time we arrived. a. leave b. left c. leaves d. had left 8. By the age of 25, he ________ two famous novels. a. wrote b. writes c. has written d. had written 9. While her husband was in the army, Janet________ to him twice a week. a. was writing b. wrote c. was written d. had written 10. I couldn't cut the grass because the machine_______ a few days previously. a. broken down b. has been broken c. had broken down d. breaks down 11. We ________English this time last week. a. learned b. were learning c. have learned d. had learned 12. Is it raining? - No, it isn't but the ground is wet. It________ a. rained b. had rained c. has rained d. has been raining 13. Her family________ to America before 1975. a. went b. have gone c. had gone d. would go 14. When I arrived at the party, Martha________ home already. a. went b. have gone c. had gone d. would go 15. Henry________ for 10 years when he finally gave it up. a. has smoked b. has been smoking c. had smoked d. had been smoking' 16. Yesterday morning I got up and looked out of the window. The sun was shinning but the ground was very wet. It________ a. rained b. has been raining c. had rained d. had been raining 17. We ________ our examination next month. a. have b. shall have c. will have had d. will be having 18. Look that those black clouds! It________ a. is going to rain b. will rain c. would rain d. can rain 19. We________ English this time next Monday. a. learn b. will learn c. are learning d. will be learning 20. We________ this course before the final examination. a. are going to finishb. have finished c. will finish d. will have finished