We should take part in such activities in future _____ we did yesterday.
| A．which | B．as | C．that | D．than |
________worries meis the way he keeps changing his mind.
| A．This | B．That |
| C．What | D．It |
________matters most in learning English is enough practice.
| A．What | B．Why |
| C．Where | D．Which |
________you’ve got a chance，you might as well make full use of it.
| A．Now that | B．After |
| C．Although | D．As soon as |
—Did you return Fred’s call?
—I didn’t need to________I’ll see him tomorrow.
| A．though | B．unless |
| C．when | D．because |
Some parts in South China have experienced________this year as they did last year.
| A．twice as much rain | B．rain twice as much |
| C．as twice much rain | D．twice rain as much |