I don’t know when my son __________back, but when he __________back ,I’ll give you a call
-How many workers are there in your factory? -______ the workers in my factory_______ over two thousand .
---I’m too busy________ to my family often. --- Why not call them instead ?
Everyone is in the classroom, _____?
We heard that many lives were lost in the earthquake in Japan.
There _____ calories in water.