Modal verbs

Choose the correct modal verbs to complete the sentences.

We aren’t supposed to / needn’t leave the school at break time, but a lot of students go out to buy sweets at the shop across the road.

We’re going away for a week. How many T-shirts do you think I must / should pack?

The great thing about Sundays is that I don't eed to / shouldn’t get up early. I can lie in bed all morning.

The police are convinced that the criminal gang must / could have known how to switch off the alarms. 

You don't have to / mustn't feed the dog, I've already done it.

I think you have to / ought to visit your grandma more often.

 You might / must have told me that my favourite film was on TV last night. I missed it!

 The person in the photo has long hair and Anna has short hair.

OK. So, it must / can't be Anna.

I must / have to finish this task today. It's in the contract.

I've already phoned Jane, you needn't / don't have to do it.

It can't / may be a tiger because the head is too small.

It's impossible to keep lion as a pet. She must / can't have lied.