．—This math problem is too difficult. Can you show me _______, Dad?
—Sure.
| A．what to work out | B．what to work out it |
| C．how to work it out | D．how to work out it |
—Can you tell me ______?
—By doing more speaking.
| A．how I can improve my English |
| B．which way can I choose |
| C．how I do deal with my English |
| D．what’s wrong with my English |
After school he didn't go home. ______, he went to the playground.
| A．But |
| B．While |
| C．Instead |
| D．Instead of |
______ summer nights, we often go to sleep ______ the window open.
| A．At; with |
| B．On; with |
| C．In; for |
| D．At; on |
If I went to the moon, I ______ bring something unusual back to the earth.
| A．could |
| B．will |
| C．would |
| D．shall |
Why do you get your hair ______ red? Do you think it's beautiful?
| A．color |
| B．colored |
| C．to color |
| D．coloring |