—The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job?

—________ my students have a try?

A．May  B．Must

C．Will  D．Shall

I ________ him in time, otherwise he would have fallen off the bike.

A．had supported  B．supported

C．have supported  D．support

The project was carefully planned, or a great deal of money ________.

A．will lose  B．will be lost

C．would have lost  D．would have been lost

—How dangerous it was!

—Yes, but for the passer­by's quick action, the girl ________.

A．was drowned  B．could have been drowned

C．had drowned  D．should be drowned

Martin hasn't got in touch with me for ages. He ________ my new cell phone number.

A．can't get  B．mustn't get

C．can't have got  D．shouldn't have got

According to the rules and regulations, all payments ________ be made in cash in the shopping center.

A．shall  B．can

C．must  D．should

—Show me your permit, please.

—Oh, it's not in my pocket. It ________.

A．must have fallen out  B．might fall out

C．could fall out  D．should have fallen out

People love the  convenience of bottled water, but if they ________ the problem it causes, they ________ try carrying water in a reusable steel container instead of plastic.

A．realized; will  B．had realized; will

C．realized; would  D．have realized; would

If you want somebody to go window shopping with you, why not try calling Marie? —she ________ be home by now.

A．shall  B．should

C．will  D．would

—How was your trip to Yancheng last week?

—Wonderful! I only felt sorry that I ________ the nature reserve of red­crowned cranes, but the weather was awful.

A．could visit  B．could have visited

C．might visit  D．might have visited