_____ 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 |
The teacher is speaking. Please stop _____ and listen to him.
| A．talking | B．to talk | C．talks | D．talked |
--May I borrow this dictionary ? ---Sorry. This is not _____. It’s Lily’s .
| A．my | B．yours | C．her | D．mine |
---_____do you go to visit your grandma ?
---Twice a month
| A．How often | B．How much |
| C．How soon | D．How long |
