There are many books on the shelf. But only one of them is ______.
-The car comes to a sudden stop. What's wrong? -The oil has __________.
It isn't quite __________ whether the teacher will collect the homework by Friday, so you needn't hurry.
I found the homework was not so heavy as __________ I __________ to get in my old school.
We all felt the plan __________.
-Did you hear someone talking in the living room? -Oh, I forgot to __________ the TV just now.