The teacher asked the students ________.
| A．what they were doing at that moment |
| B．what were they doing at that moment |
| C．how are they doing at that moment |
| D．what they are doing at that moment |
It's an either-or situation．You can watch TV or play games，but you can't do ____．
| A．others | B．either |
| C．another | D．both |
--I'd like to book a room for tonight．
--Sorry，sir，but we don't have any rooms ____ right now．
| A．able | B．comfortable |
| C．available | D．suitable |
The astronauts were so interested in____ beauty of nature that they took lots of pictures in____ space．
| A．the; / | B．the；the |
| C．/；the | D．/; / |
He speaks ________ fast ________ I can’t follow him．
| A．so；that | B．such；that |
| C．so；as to | D．enough；that |
一Could you please give us some advice on ________ English at home?
—You need to do a lot of reading and listen to English radio programs．
| A．why to read | B．how to learn |
| C．when to use | D．what to study |