Exercise 4: Choose the best answer to complete each of the following sentences. 1. The death rate would decrease if hegienic conditions _________ improved. A. were B. had been C. is D. A and B are correct 2. The education in Japan ___________ if the basic principles of education had not been taken into consideration. A. would go down B. would have gone down C. went down D. had gone down 3. If there ________, the rice fields could have been more productive. A. had been enough water B. were enough water C. would be enough water D. are enough water 4. The patient could not recover unless he __________ an operation. A. had undergone B. would undergo C. underwent D. was undergoing 5. If she ________ him, she would be very happy. A. would meet B. will meet C. is meeting D. met 6. If he ________ a thorough knowledge of English, he could have applied for this post. A. had had B. had C. has D. has had 7. If I had enough money, I __________ abroad to improve my English. A. will go B. would go C. should go D. should have to go 8. The bench would collapse if they _________ on it. A. stood B. stand C. standing D. stands 9. If it _________ convenient, let's go out for a drink tonight. A. be B is C. was D. were 10. If you _________ time, please write to me. A. have B. had C. have had D. has