—Today, I met a classmate I haven't seen for many years! 

— ________.

A.Enjoy yourselves B.What a surprise C.Congratulations D.It doesn't matter

It's too early. I don't think the ticket office is open ________ nine.

A.before B.at C.until D.since

________ he had a good start, I made my effort to run after him at last.

A.When B.Because C.If D.Though

One of the multi-function (多功能) gloves was invented by a junior 3 student in Suzhou.  _________ amazing creation it is!

A.What B.What a C.What an D.How

Remember how you allowed me ________for dance and music lesson.

A.enter B.entering C.to entering D.to enter

It's a pity that some students waste energy _________ on line.

A.to chat B.chatting C.chat D.to chatting

During this special time, the way people ________each other has changed, we don't shake hands or hug any longer.

A.greet B.accept C.recognize D.help

—Look at the clouds in summer twilight (黄昏)! They are so beautiful.

—Yeah. The beauty _______ ten minutes.

A.lasted B.lasts C.has lasted D.will last

While my mother ________ some shopping yesterday, she happened to meet an old friend of hers.

A.did B.was doing C.would do D.had done

As I'm busy with my assignment, you __________ have your private time in your own room.

A.must B.can C.need D.should