Question

Read these sentences and choose the correct answer to fill in the gaps.

1. That's ridiculous- you ____ be joking.

must
can

2. They're two hours late- there ___ be something wrong.

can
must

3. My sister _____ read.

must
can

Answer 1

1) must
2)must
3)can
4)
5)

Answer 2

1. must  

2. must

3. can