It's so cloudy, I think it __________.
| A．rain | B．rains |
| C．is going to rain | D．is raining |
---Have you read this book ?
---Yes . I _____ it two weeks ago .
| A．is reading | B．have read | C．will read | D．read |
— Are you confident about the English Speech Contest, Sally?
— __________. I’ve got everything ready!
| A．Of course not | B．It’s hard to say |
| C．Sure, I am | D．I am afraid not |
---Which would you like to drink , coffee or orange juice ?
---___. Please give me a cup of tea.
| A．None | B．Both | C．All | D． Neither |
_____ he was tired , ____ he didn’t stop working .
| A．Although ; but | B．Though; / |
| C．But ; / | D．Though ; but |
The air in Lanzhou is getting much _____ now than a few years ago .
| A．clean | B．cleaner | C．cleanest | D．the cleanest |