It is believed that ________ December 21st, 1891, the first basketball game in history was played.
| A．on | B．in | C．at | D．by |
I have a big brother. name is Paul.
| A．He | B．Her | C．His | D．Your |
Write_______ and try not to make any mistakes.
| A．as carefully as you can | B．as careful as possible |
| C．more careful | D．as careful as you can |
Talk to your teacher and you will get help ________ you have a problem.
| A．if | B．so | C．until | D．unless |
Mr. Black used to be busy. But now he’s retired and , so he has plenty of time to exer cise.
| A．hard | B．calm | C．free | D．nervous |