1) I've injured my foot.  I _____________ walk but it hurts. a) can b) must c) should 2) Last year, I broke my leg and I _______________ walk for 3 months. a) must not b) can't  c) couldn't d) weren't able to 3) If you've got a toothache then you __________ go to the dentist. a) must b) could c) are able to d) have to 4) You look so tired. I think you ____________ stay in bed today. a) have to b) able to c) must d) should 5) I've been at home all day because I'm sick, but I've __________ do lots of work on my computer. a) could b) been able to  c) can d) should 6) Please don't phone me. I've got a sore throat and I __________ talk a) musn't b) don't have to c) shouldn't d) couldn't

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