They use computers to keep the traffic _________ smoothly.

Is Doctor Green ________ ORBIS doctor—No， he is ________UNICEF volunteer. But he sometimes works with ORBIS.

Generally speaking，the Internet makes________possible for people to get the information they need quickly.

Why did you major in Literature? —I________ listened to my mother. She wants me to major in Business.

We’re going to enjoy ________ d