---Must I clean the window now?
---No, you ______.
| A．mustn’t | B．needn’t | C．can’t | D．may not |
---We're going for a picnic next Sunday, and I'd like you to join us.
---____________！I have to see my grandmother. She has been ill for two weeks.
| A．What a pity | B．Good luck | C．That’s all right | D．Go ahead |
---- May I smoke here?
--- If you, choose a seat in the smoking section.
| A．should | B．could | C．must | D．may |
There are lots of problems in your hometown, but we're happy to see many of them________.
| A．are solving | B．are solved | C．have solved | D．are being solved |
Everyone is different and that is ________ makes our world so much better.
| A．that | B．which | C．what | D．who |
The rich shouldn't________their wealth. Instead, they should contribute more money to the poor.
| A．show off | B．take off | C．put off | D．give off |