---Hello, Sam. --- .
| A．Yes, David | B．Sorry, David |
| C．How do you do, David | D．Hi, David |
_____for a long time is bad for your eyes.
A.Reading B.Read C.Playing football
-----___________________.
-----Much better.Thank you.
A.How are you feeling today？
B.What happened to you?
C.What can I do for you?
While she was trying to cross the road,she saw a red car_____.
A.come B.to come C.coming
---I don’t know much about computer.
---I don’t know,____.Let’s go and ask for help.
A.also B.either C.too
We should keep our classroom ____ .
A. clean B. to clean C. Cleaning