Who is singing in the next room –––It_______ be Lucy. She has gone to Hong Kong.

Now everyone here was working hard and doing what they could ________ more money．[ ]

driving used to occur _______, butnow it is under control.

The population of China___ to many times what it wasin 1949, and most of its population ___ farmers.

We can’t do it that way — but whether it will work is ______ matter.