________there are living creatures in the outer space as those on Earth hasn't been proved until now.

A．How  B．When

C．Where  D．Whether

The reason________death was feared was________no man could experience it twice.

A．why; that  B．why; because

C．why; why  D．because; that

The government has________to the outbreak of violence by sending scores of soldiers to police the area.

A．reacted  B．contributed

C．adapted  D．turned

You see，the arrow on the wall________the way to the parking lot.

A．announces  B．indicates

C．declares  D．says

________earlier online survey showed that ________majority of Chinese believe Yuan Longping deserves a Nobel Peace Prize for his contribution to fighting against world hunger.

A．The; the  B．The; a

C．An; /  D．An; the

Jack，did it ever________to you that you would be punished for cheating in the exam?

A．happen  B．reflect  C．occur  D．strike

Many people think it's very difficult to ________ a conversation with someone who only says “Yes” and “No”.

A. break off  B. focus on

C. keep up  D. listen to

There is a great deal of evidence________ that music activities engage different parts of the brain.

A. indicate  B. indicating

C. to indicate  D. indicated

—Who do you guess I am?

—Sorry，your name________ my mind.

A．slipped  B．has slipped

C．had slipped  D．slips

By no means________true that all native speakers of English know their own language very well.

A．is that  B．that is

C．is it  D．it is