Not until the train pulled into the station ______ that his suitcase was gone.
| A．did he find | B．had he found |
| C．he had found | D．he found |
—I think the environment is becoming worse.
—Yes, I really don’t know we can do about it.
| A．which | B．whether |
| C．that | D．what |
We all think it is Jack, rather than his parents that responsible for his bad manners in public.
| A．are | B．is |
| C．were | D．be |
The news shocked the whole nation a strong earthquake hit Yushu on Apr.14, 2010.
| A．what | B．when |
| C．that | D．which |
It was about 600 years ago _______the first clock with a face and an hour hand was made.
| A．until | B．when |
| C．before | D．that |
We must keep in mind the fact __________ China is still a developing country.
| A．whether | B．that |
| C．why | D．when |
Only when _______ hard _______ make your dream come true.
| A．do you work; you can | B．you work; you can |
| C．you work; can you | D．do you work; can you |
When it comes to relieving stress, proper rest and good nutrition can help, _______.
| A．so does good parenting | B．so good parenting does |
| C．so good parenting can | D．so can good parenting |
While watching television, __________.
| A．the doorbell rang |
| B．the doorbell rings |
| C．they heard the doorbell rings |
| D．they heard the doorbell ring |
Thomas wants to know ______Nina lives.
| A．where | B．who |
| C．what | D．if |