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

A. before　 B. until　 C. after　 D. for

10、Never chase two rabbits _________.

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

9、It is _______that the letter will ____you this afternoon.

A. most like; arrive　　　　 B. likely; reach

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

8、___ 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

7、She is in hospital now____treatment.

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

6、________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

5、The excited speaker was talking on, _________.

A. a crowd gathered　　　　　 B. a crowd gathering

C. gathered a crowd　　　　　 D. gathering

4、______, and listen to the teacher carefully.

A. Gathering　　　　　　　　　 B. Gather

C. Gathered　　　　　　　　　 D. Having gathered

3、The other day on the street he ___one of his friends whom he hadn’t seen for ages.

A. run into　 B. run across　　 C. ran into　　 D. ran away

2、We might as well take a rest; we have ____trying paper.

A. run into　 B. run out of　 C. ran out　　 D. ran across