—I forgot my mother's birthday!
—________ Better keep it in mind next year.
| A．I'm afraid so. | B．So what? |
| C．You did? | D．No wonder. |
The difficulty we now meet with is ________ we can persuade him to tell the truth.
| A．whether |
| B．that |
| C．what |
| D．why |
Then Mr Smith told me ________ he was doing was very important.
| A．that |
| B．why |
| C．what that |
| D．why what |
Would you mind telling me _______ language your friend speaks?
| A．which |
| B．what |
| C．how |
| D．that |
When I try to understand ________ that prevents children from getting fat, it seems to me that there are two reasons.
| A．why it is |
| B．what it is |
| C．why is it |
| D．what is it |
China’s success in manned-spacecraft travel shows ________ our country has become one of the greatest powers in space research.
| A．what |
| B．which |
| C．/ |
| D．is that |