Take care! This kind of glass ___ easily.
| A．is broken | B．was broken | C．breaks | D．has been broken |
The government has _______ the parents to work with teachers in the education of their children.
| A．asked for | B．called for |
| C．looked for | D．paid for |
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 |