1. My mobile is ringing. It ... be Kate.
2. When I was young I ... play football very well.
3. Your hair's too long. I think you ... get it cut.
4. Liz ... get tired of her job sometimes. It is so boring.
5. Where's Tom ? He ... be in his office.
6. ... it be true? I don't believe it.
7. ... we stay or leave ?
8. That club ..... be very good. It is always full of people.
9. You got here very quickly. You ..... have run.
10. Do you have a pen? No, but ask Peter, he may ..... one.