The traffic on the main streets has a longer green signal than _______ on the small ones.
| A．one | B．this | C．that | D．it |
Bill suggested________a meeting on what to do for the Shanghai Expo during the vacation.
| A．having held | B．to hold | C．holding | D．hold |
________our manager objects to Tom's joining the club，we shall accept him as a member.
| A．Until | B．Unless | C．If | D．After |
We________on this project for four hours.Let's have a rest.
| A．are working | B．have been working |
| C．worked | D．had worked |
Tom________tell the truth to his boss because he didn't want to make trouble.
| A．daren't to | B．dare to | C．dared not | D．dare |
Our boss is very ________，so we have to arrive on time，or we would be fined.
| A．serious | B．strict | C．energetic | D．organized |