.Unless you have planted something, you won7t be able to know the pleasure of watchintit _______
The teacher apologized late.
_____ in a heavy rain, the teacher fell ill and couldn’t but ______ for a leave.
As soon as he comes back, I’ll tell him when __________ and see him. \
Our teacher said to us that the earth _________ around the sun.
While _________, people sometimes can’t help buying something they don’t really need.