______ city in Zhejiang Province, located on the river’s upper reaches, is believed to be ______ source of the dead pigs.

A．The; a            B．The; the           C．A; the            D．A; a

This practice satisfies people of high moral standards psychologically and materially and ______ encourages other people’s enthusiasm.

A．on the contrary     B．in the meantime    C．from time to time    D．all at once

In this section, we will briefly describe possible ways of reducing the costs and risks ______ in doing this.

A．involving          B．involved          C．to involve         D．being involved

How can they learn anything ______ they spend all their spare time watching television?

A．when            B．though            C．while             D．before

Johnson would have faced the music but he ______ doing things like that.

A．had stopped       B．stopped           C．was stopping       D．has stopped

For most informal dinners, you should wear comfortable and ______ clothes.

A．official            B．formal            C．casual            D．proper

More than 800,000 Chinese overseas students have returned in the last five years, with the annual number ______ by an average rate of 36 percent each year.

A．growing           B．grown            C．to grown          D．having been grown

—I thought you ______ for vacation tomorrow.

—I had planned to, but I have a very important meeting to attend tomorrow.

A．will leave          B．are leaving         C．have left          D．were leaving

As a result of the fog haze weather, nowadays many people are longing to live ______ the air is fresher.

A．that              B．when             C．where            D．in which