Choose the best modal verbs to complete the sentences.

Choose the correct option.

Oliver thought that he [can't|might|must] have left his phone at home. Actually, he's quite sure of that.

Jane [might|can't|must] be at home now. I saw her in the shop thirty minutes ago. It usually takes her an hour to get home.

The boy [may|can't|must] be a drug addict. It's pretty obvious. He's acting really weird and his pupils are dilated.

My dad [couldn't|can't|must] have left the house because his jacket is still here.