—The two people speak different languages and can not communicate with each other well.

—Oh，I see. That’s ________ misunderstanding occurs.

A．when B．what C．which D．why

Besides proper diet, exercise is one of the key ___________of a healthy lifestyle.

A. components B. categories C. ranges D. processes

Too often we underestimate the power of a touch, a smile, a kind word, or the smallest act of caring, all of which have the potential to _______ a life _______.

A. get… up B. take… off C. bring… up D. turn… around

The course about Chinese food attracts over 100 students per year, _______ up to half are from overseas.

A． in which B．of whom C． with which D． for whom

After the trainer was sure that the whale could look after itself, he _______ it into the sea.

A. transported B. delivered C. released D. handled

----What’s that noise?

---- There’s a truck stopping outside．It’s someone something.

A．deliver B．to deliver C．delivering D．delivered

—I wonder what makes you a successful manager.

—I ________ as a waiter for five years，which contributes a lot to my today’s work.

A．serve B．have served C．had served D．served

— It’s no easy task to catch a ticket on a website that receives 1 billion clicks daily.

—I can’t agree with you more. There ________ be errors for every single step.

A．should B．must C．will D．can

— Do you know __________ they got to know each other?

— It was last year ________ they both taught English in China.

A． when was it that; when B． when it was that; that

C． when it was that; when D． when was it that; that

The agent was about to sign his name to the document ________，to our surprise，a stranger broke in to prevent him.

A．while B．when C．a(chǎn)s D．until