There ______more and more foreigners learning Chinese now.

When do you often get up —I often get up at in the morning.

People often have this belief _______economic development is bad for the environment, but this does not have to be true.

________ the rapid growth of short messages sent by mobile phones, the increasing number of criminal cases appeared through short messages

You needn’t have ________ the speaker when he was speaking; there was enough time afterwards for you to ask questions.