You'd better learn the new rules by heart.
| A．study…hard | B．keep…in mind |
| C．following | D．agree with |
It’s two and a half weeks since the exchange students __________ Wuxi.
| A．arrived | B．reached | C．have been in | D．have arrived in |
Little Tom has got a lot of birthday presents, but he isn’t able to take all of them ___.
| A．on time | B．at a time | C．at same time | D．from time to time |
We can have ___ bluer sky if we create ___ less polluted world.
| A．a. a | B．a, the | C．the, a | D．the, the |
---- I’m too nervous to give a talk in front of so many people.
---- __________, Maria. You can do it.
| A．Come on | B．With pleasure | C．That’s true | D．You’re right |
----- I haven’t heard from Henry for a long time.
----- What do you think ___________ to him?
| A．has happened | B．to happen | C．was happening | D．had happened |