Not until actually ____ with water shortage ____ appreciate the value of water to a region.
--Must we hand in our homework now?---No, you ___. You ___ hand them in before Friday.
When I was walking in the street, I heard my name ___.
We ___ to the farm last week.
You’ ll feel better as long as you ___ the doctor’s advice.
I can’t find my English book. I must ___ it at home this morning.