This is an important problem. Please .
A. write it down
B. write down it
C. write it in
Don’t ______your hope and try again.
| A．give up | B．look up | C．wake up | D．make up |
We can’t do well in exams we study hard.
| A．if | B．and | C．since | D．unless |
As a student, it is your to study hard.
| A．duty | B．mistakes | C．notes | D．challenge |
When I have problems I often ask my father .
| A．to helping | B．help | C．for help | D．to help |
Can you tell me the best way the problem?
| A．solve | B．solved |
| C．to solve | D．solving |