giải chi tiết giúp mình, mình đang cần lắm ạ, xin mỗi người giúp 15. It rained heavily all day, ................. was a great pity. A. that B. what C. which D. who 16. Joy is somtimes …………… a matter of doing things we like. A. simple B. simply C. simplicity D. simplification 17. The heavy rains helped to ease the water…………………... A. short B. shortly C. shortage D. shortened 18. Mrs Ria was a ………………..woman who got a lot of qualifications. A. culture B. cultural C. culture D. cultrured 19. The travel companies succeeded in ……………………..winter sports for all ages. A. popularizing B. popular C. popularize D. popularity 20.The exhibition is spoiled by the ……………………….of the production. A. cheap B. cheaply C. cheapen D. cheapness 21. Mr. Johnson made a short speech of ………………………... A. accepting B. acceptance C. accept D. acceptable