The trick to marketing is to find out your customers and take steps to ______ their needs.[ ]

Is the man over there your new teacher –No, it _______ be him. He has gone to Shanghai for a meeting.

Haven’t you seen MrWilson at the lecture? –Yes, but he had left _________ I could ask him any questions

ience of computer,____ rapid progresshas been made, is the most important of all.

How many computers are there in the room —________．Some workers moved them to another place just now．