________on the road is very dangerous.
| A．Play | B．Played |
| C．Playing | D．Plays |
---I met your boss in the street this morning.
---Ah? You _____ be joking. He flew to Europe yesterday!
| A．must | B．should | C．could | D．might |
--- When will our graduation ceremony be held?
---______ two weeks’ time, _______ 18th June.
| A．On, in | B．In, on | C．On, on | D．At, on |
There are over 58,000 rocky objects in_____ space，about 900 of which could fall down onto ______ earth．
| A．the；the | B．不填；the | C．the；不填 | D．a；the |
---I heard quite a few bikes were thrown away at Liaocheng University.
--- _________________. They should be made use of.
| A．I hope not. | B．Take it easy. |
| C．Not much. | D．That’s too bad. |
There are so many foggy days these years. We all wonder ______________________.
| A．what can we do to prevent it |
| B．what we can do to prevent it |
| C．how can we do to prevent it |
| D．how we can do to prevent it |