______ you work more efficiently are you able to catch up with others in the class.

A Only when     B Long before      C Unless          D Until

I think there are only a few sports that are both ____ and ______.

A entertaining…relaxed   B entertaining…relaxing

C entertained…relaxed    D entertained…relaxing

The careless driver is ______ for the traffic accident ______ yesterday.

A to blame. .happened     B to blame…h(huán)appening

C to be blamed…h(huán)appened  D to be blamed…h(huán)appening

He said that he had nothing _______.

A to feed his birds       B to feed his birds with

C to feed his birds on    D feeding on his birds

In the Olympic Games, swimming is ______ second ______ importance only to track and field events.

A the…to   B /…to    C the…in       D/…in

Many neighbours _______ that they couldn't stand the noise of the machines on the construction sits.

A complained     B informed     C described      D expressed

The explorer got a disease in blood for the _____ of fresh vegetables and fruit.

A sake           B lack         C ignorance      D knack

The ship ＂Titanic＂was _____ when it hit into an iceberg.

A wounded B sunk C wrecked D failed

I wonder if such a little boat can _____ so many passenger to the other side of the river at a time.

A occupy         B hold         C fetch          D carry

They seemed not to be ______ of what was happening around him.

A known   B clear     C anxious    D aware