“The children are playing in the park.”The main structure of the sentence is______.
| A．S+V | B．S+V+DO+OC | C．S+V+IO+DO | D．S+V+P |
You ____ swim here. It is said that sharks (鲨鱼) have been seen.
| A．can | B．may | C．mustn’t | D．needn’t |
— I hope you can ____ and see us next time you come to Shanghai. — Sure, I will.
| A．drop in | B．check in | C．give in | D．arrive in |
Playing computer games ____ the boy so much time that he doesn’t have enough time to study.
| A．spends | B．uses | C．pays | D．takes |
As students, ____, we should study hard to be well prepared for the future.
| A．at all | B．in all | C．after all | D．above all |
The maths problem was so difficult that none of us could ____.
| A．try it out | B．work it out | C．look it up | D．work on it |