Iwasn’t able to finish my homework because I was ill.A. can’t B. couldn’t C. shouldn’t
Could you ring me up as soon as Lily _____________ in Beijing?
–Could you tell me ______________? --- Nothing serious, just a little cold.
You’d better ______________ out, Jim. It’s raining hard.
We had no choices _____________ home, for the last bus went before we arrived.
The teacher showed us ______________ the problem.