---Where’s your father? ---He ______ to work.
| A．has gone | B．went | C．has been | D．will go |
—What shall we do this Saturday?
— it rains, we’ll have a picnic in Century Park.
| A．If | B．Unless | C．Because | D．When |
It's a pity that I didn't think of ringing you .
| A．earlier | B．earliest | C．early | D．the earliest |
To remember things accurately, we don't allow other thoughts our mind.
| A．enter | B．to enter | C．entering | D．entered |
If you travel around the world, you will be surprised at ________.
| A．how different the foreign customs are |
| B．how the foreign customs are different |
| C．how different are the foreign customs |
| D．how are the foreign customs different |
-__________ has Line 22 (From Jinshanwei Station to Shanghai South Railway Station) been open to traffic?
| A．How far | B．How soon |
| C．How long | D．How much |