【2012天津】A snake bit him ___________ he went to see a doctor at once.
| A．if | B．where | C．because | D．so |
-- Do you mind my joining your discussion? -- ______ You are so welcomed.
| A．Never mind. | B．Yes, please. |
| C．Of course not. | D．You’d better not. |
--Must we stay in the classroom and finish all the homework?
--No, you______. You can take it home.
| A．needn’t | B．may not | C．mustn’t | D．can’t |
Children are often warned ______ with fire.
| A．not to play | B．to play | C．don’t play | D．doesn’t play |
By yesterday, the plane ______out of view for more than a month.
| A．is | B．has been | C．was | D．had been |
Have sports training every day, ______you won’t be healthy in the future.
| A．because | B．or | C．unless | D．since |