415. _______drinks the polluted water gets sick.

　 A. People who　 B. Person who　 C. Anyone　 D. Anyone who

414. Bad luck. It never rains but it _________.

A. is poured　　 B. pours　　 C. pouring　 D. poured

413. A cat is similar ____a tiger in many ways.

A. with　 B. for　　 C. to　 　D. form

412. Though he told me a second time about it, _____I didn’t understand.

A. but　 B. still　　 C. however　 D. but yet

411. It will be a long time ___we see each other; take care and good-bye.

A. before　 B. until　 C. after　 D. for

410. Never chase two rabbits _________.

A. at one time　 B. one time　 C. at a time　 D. for a time

409. It is _______that the letter will ____you this afternoon.

A. most like; arrive　　　　 B. likely; reach

C. mostly like; get　　　　 D. best like; reach

408. ___ waste water was put into the rivers, and lakes which were badly polluted.

A. At one time　 B. At a time　 C. One time　 D. A time

407. She is in hospital now____treatment.

A. receives　 B. being received　 C. receiving　 D. received

406. ________to get rid of waste ___a big problem for the human beings today.

A. How ; is　 B. What; is　 C. What; are　 D. How; are