— Susan, would you like to go hiking with us this afternoon?— I'd love to, but I study for a test.A. may B. have to C. can
--- Would you like to go birdwatching with us? --- .
He will work in this school _______.
The number of the red-crowned cranes will become ____ if we don’t take any action.
---You were out when I went to your house this morning. ---Oh, I _______ for a friend from England at the airport.
He is getting ______ to hear the ____ words.