—Look! Someone ________ the floor.

—Well, it wasn't me. I went shopping just now.

A．had swept  B．has swept

C．was sweeping  D．is sweeping

It's said that they ________ a better life ever since they moved to the US.

A．had enjoyed  B．have been enjoying

C．were enjoying  D．would enjoy

—Ouch! You hurt me.

—I'm sorry. But I ________ any harm. I ________ to drive a rat out.

A．don't mean; am trying

B．didn't mean; tried

C．haven't meant; tried

D．didn't mean; was trying

In general, most tennis ________ on hard courts or on clay.

A．plays  B．is played

C．has played  D．has been played

Despite ongoing street protests, US beef ________ in South Korea due to its lower price.

A．is sold well  B．sells well

C．sells poorly  D．is sold poorly

Today many physical bookstores ________ down with financial difficulties, inflexible management strategies and competitive pressure from online bookstores.

A．had closed  B．having closed

C．being closed  D．are closing

—Look, I've got admission to Harvard University for a short­term study next semester.

—How fantastic! You ________ a different university life then.

A．have experienced  B．will be experiencing

C．have been experiencing  D．will have experienced

—Car prices have been going down sharply in the last 20 years.

—It's not surprising because the law of market ________ the price of a product.

A．is controlling  B．controls

C．has controlled  D．controlled

—We'll go to the party to be held in Qinghai Grand Theater at 8 tonight. Could you join us?

—I'm afraid I can't. I ________ the holiday plan with my friends.

A．am discussing  B．have discussed

C．will be discussing  D．will have discussed

Mother reminds, “________ rain, take an umbrella.” as spring approaches.

A．Shall it  B． It shall

C．Should it  D．It should