----Smoking should ____________ in school.
----I agree. It’s bad for our health.
| A．be allowed | B．not allow | C．allow | D．not be allowed |
Are you going to __________ this challenge?（挑战）
| A．take up | B．take down |
| C．take off | D．take on |
You _______ pay too much attention to your reading skills, as it is so important.
| A．can’t | B．shouldn’t |
| C．mustn’t | D．needn’t |
Green represents________and nature. When you feel weak, you can wear green.
| A．sadness | B．purity |
| C．joy | D．energy |
--- Cross the road carefully, __________ you’ll keep yourself safe.
--- Thank you.
| A．so | B．or | C．but | D．and |
---Why do you like yellow?
--- Because it always reminds me __________ a warm, sunny day.
| A．on | B．in | C．of | D．for |