If law and order as well as rules and regulations______, neither the citizen nor his property is safe.

Most animals and plants are _______ large or sudden changes in temperature, so the ocean is a safe and comfortable habitat.

If you have any problems, you can ask Dr. Know-all _________ help.

_______ he got up early this morning, _______ he didn’t catch the early bus.

You speak good English. Could you tell me________ You’d better communicatewith others in English as much as possible.