When you want to go into the room，you should________ the door．
| A．knock on | B．knocking on |
| C．knocks on | D．to knock on |
You have to leave now _________ you can catch the early bus．
| A．so that | B．as soon as | C．because | D．if |
Jim asked Ling Fenghis pet dog while he was away.
| A．not to forget to look after | B．not to forget looking after |
| C．don’t forget to look after | D．don’t forget looking after |
—Would you like tea or coffee?
—_________ is OK．I really don't mind．
| A．None | B．Either | C．Neither | D．Both |
It is my favorite book which is about _________．
| A．how did Alice find her lost parents |
| B．what did Alice find her lost parents |
| C．how Alice found her lost parents |
| D．what Alice found her lost parents |
China is developing _________ of all the countries in the world．
| A．fast | B．faster | C．fastest | D．the most fast |