Dr. Dewey has four sons: ____ is in London and _____ in New York.

We have five typewriters in our office, but ____ of them are in good order.

Nothing but books ____ sold in this shop.

You ____ do it if you don’t want to.

Xiao Li is so wet. She _____ into the lake.

They _____ visit us a lot but they don’t now.

These are instruments _____ in the experiment.

When _____ to 0 ℃, water will be changed into ice.

While ____ for the bus, the old man met his old friend.

Is there anything you want from downtown? I’m going to get those letters _____.

We heard her _____ in the next room.

_____ in Beijing for more than twenty years, he knew the city very well.

This news sounds _____, but we are not ______.

If the doctor had been available, the child _____.

It is important that he ____ to the manager before leaving for his vacation.