Look! The light in the room is still on. Mr. Liu at work.
| A．must | B．can’t be | C．must be | D．have to be |
— I have ______ in learning chemistry. Could you help me with it?
— Sure, I’d love to.
| A．success | B．interest | C．trouble | D．fun |
----Why did you vote for Maggie?
----Because she is very ________. She always shares things with others.
| A．generous | B．active | C．practical | D．energetic |
It’s very convenient ______ us to buy train tickets now because we can buy them either from the station or on the Internet.
| A．to | B．of | C．by | D．for |
— Alice, I can’t find my bike.
— Don’t worry. I saw ______ black one under the tree. Is it yours?
| A．a | B．an | C．the | D．不填 |
--- My math teacher said I was too lazy.
--- ______________. You should work harder.
| A．Good idea | B．I’m sorry | C．Good luck | D．Have a great time |