I soon found that the work I was doing had already been done by someone else. _______, I was wasting my time.
| A．In other words | B．In a word | C．As a result | D．In addition |
. The plan ___ just because people were unwilling to co-operate（合作）。
| A．broke down | B．pulled down | C．turned down | D．put down |
. My study of biology has ___C___ much of my spare time， but it has given me a great deal of enjoyment.
| A．taken off | B．taken down | C．taken up | D．taken away |
. Elephants would ______ if men were allowed to shoot as many as they wished.
| A．die down | B．die out | C．die away | D．die off |
. I had to ______ because someone else wanted to use the phone.
| A．give up | B．put up | C．hang up | D．ring up |
. “Have great changes taken place in your village？” “Yes， A new school was ______ in the village last year.”
| A．held up | B．set up | C．sent up | D．brought up |