Drivers ........ drive over the speed limit. (mustn't / can't / shouldn't)
mustn't
You ....... do more sport if you want to lose weight. (must / can / should)
should
We ....... stop when the traffic light is red. (must / can / should)
must
I ......... afford that. It's too expensive. (mustn't / can't / shouldn't)
can't
I know he speaks five languages, but ....... he speak Chinese? (must / can / should)
can
You ........ remember to send that e-mail. It's very important! (must / can / should)
must
Hey I'm lost. ...... you help me? (Must / Can / Should)
Can
She looks very sick. I think she ...... go to the doctor. (must/ can / should)
should
You ...... smoke so much. It's bad for your health. (mustn't / can't / shouldn't)
shouldn't
I ........ come to your house in about 10 minutes. I'm really fast! (must / can / should)
can
You ....... do your homework first if you want me to let you go out with your friends. (must / can / should)
must
You ......... take the blue one: it suits you! (must / can / should)
should
You have a beautiful voice. You ....... sing for us! (must / can / should)
must
She ........ take an umbrella: it's going to rain! (must / can / should)
should
You are driving all day. You ...... be exhausted! (must / can / shouldn't)
must
I think we ..... take this road: it's not on my map! (mustn't / can't / shouldn't)
shouldn't
I ........ believe that you failed your test! (mustn't / can't / shouldn't)
can't