Question

Q5 - It ____ be the postman; it's far too early.
can't
mustn't
Q6 - You ____ enter the country without a visa.
can
must
Q7 - They're two hours late- there ___ be something wrong.
can
must
Q8 - She left two hours ago, so she ____ have arrived by now.
can
must

Answer 1

Q5 - It can't be the postman; it's far too early.

Q6 - You can enter the country without a visa.

Q7 - They're two hours late- there must be something wrong.

Q8 - She left two hours ago, so she must have arrived by now.