Complete the sentences with the words given: can't be, may be, must be, can't have been, must have been

1. Jane _______________ to at least 50 different countries by now – every year she travels for three or four months.

2. Andrew's plane landed in Málaga three hours ago. He _______________ at the beach now. I'm sure he's having a great time.

3. It's a public holiday tomorrow. There _______________ a lot of people at the airport.

4. The information in this guide book is all out-of-date. Its authors _______________ to Hungary for a long time!

5. This _______________ the only direct train to London. I'm sure there are more.