请根据句意从方框中选择合适的动词，并用其适当时态填空，使句子通顺。
| choose do have fly happen |
1. How time _________! Here you are graduating from a middle school.
2. Today’s young people keep hands on the phone wherever they go, even while they _________ meals.
3. We Canada for the coming holiday，and the next step is to plan our route carefully.
4. What do you think __________ to John if he finds his car has been stolen (被偷)?
5. ---Have you finished homework?
---Not yet. But I _________ it the whole morning.
1.flies 2.are having 3.have chosen 4.will happen.5.was doing