Exercise 1 — Complete the sentences
1. She has won every competition this year. She must / can't / might be a very dedicated athlete.
2. He never recycles anything. He must / can't / might care much about the environment.
3. I am not sure where she is — she must / can't / might be at the departure lounge already.
4. That assignment is only two pages long. It must / can't / might have taken more than an hour to write.