I'll never forget the day _______ I bought my own guitar with my own money.
| A．where | B．on which | C．on when | D．that |
________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 |
Mark was afraid of being scolded，so he________say what he thought to his parents.
| A．dare not to | B．doesn't dare to |
| C．dared not to | D．didn't dare to |