___ with care, one tin will last for six weeks.
| A．Use |
| B．Using |
| C．Used |
| D．To use |
He was educated at the local high school, ______ he went on to Beijing University.
| A．after which | B．after that | C．in which | D．in that |
—Ouch! You hurt me!
—I am sorry. But Iany harm. Ito drive a rat out.
| A．didn’t mean; tried | B．don’t mean; am trying |
| C．haven’t meant; tried | D．didn’t mean; was trying |
He didn’t make __________ clear when and where the meeting would be held.
| A．this | B．that | C．it | D．these |
Dogs have a very good ___________ of smell and are often used to search for survivors in an earthquake.
| A．sense | B．view | C．means | D．idea |
Only in this way will you get your valuable ideas __________ ; or your time will be wasted.
| A．over | B．across | C．away | D．down |