There are some health problems that, when ________ in time, can become bigger.
| A．not treated | B．not being treated |
| C．not to be treated | D．not having been treated |
. John has put on so much weight recently that his mother has to ______ all his trousers to his measure.
| A．let out | B．give away | C．bring in | D．make up |
. 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 |