-- I will buy you a new bike if you learn how to swim this summer. -- Is that a _______? I'm sure I'll get the bike.
If you have questions, you should ask the teacher _______ help.
Yesterday ___ 8-year-old boy fell into the river.____ boy was saved by ______policeman.
This pair of shoes ____________ $80.
Do you have ______________ to tell me?
Our teacher told us _______________ carefully in class.