--- My son is lost. Did you see a boy pass by here?
--- I saw ______ boy hidden behind ______ tree over there. You may go and have a look.
| A．a; the | B．不填；the | C．a; 不填 | D．a; a |
There are so many books!It is not easy for us to decide what to take and what to______.
| A．take on | B．pick up |
| C．leave behind | D．work out |
A model or an experiment in a science class can help students see things which would ______ remain hidden.
| A．otherwise | B．still | C．thus | D．therefore |
How to balance the government's budget without raising taxes is a ______problem.
| A．firm | B．tough | C．secure | D．stable |
On your way to New York William will keep you ______if you don't want to be lonely.
| A．company | B．companion | C．safety | D．friend |
Don't ______.You will ______ new customs and different ways of thinking.
| A．lose your heart；apply to |
| B．lost heart；apply yourself to |
| C．lose your heart；adapt to |
| D．lose heart；adapt yourself to |