Everyone knows now that plastic pollution is ________ huge problem for the environment.
| A． |
a |
B． |
an |
C． |
/ |
---May I do the rest of the work tomorrow?
---Yes, of course. You finish it today.
| A．must | B．mustn’t |
| C．needn’t | D．could |
---May we go home mow ?
--- No, you____. You____ to go home until 5 o’clock.
| A．mustn’t; are allowed |
| B．don’t have to; are supposed |
| C．needn’t; aren’t allowed |
| D．can’t; aren't supposed |
Tom ______ come with us together, but he is not very sure yet.
| A．must | B．may |
| C．can | D．should |
—Whose magazine is this?
—It Ben’s. It has his name on it.
| A．might be | B．must be |
| C．can’t be | D．should |
— Remember: you _______ keep it secret and leave it closed.
— No problem.
| A．would | B．should | C．may | D．can |