Barack Obama, _________ African America, was elected as _________ 56^th President of the United states．

A．/, the

B．/,/

C．an, the

D．an,/

It was not until dark ________ he found ________ he thought was the correct way to solve the problem．

A．that; what

B．that; that

C．when; what

D．when; that

The number of traffic accidents that ________ in developing countries ________ increasing．

A．happen; is

B．happens; is

C．happens; are

D．happen; are

Recently a survey ________ prices of the same goods in two different supermarkets has caused heated debate among citizens．

A．compared

B．comparing

C．compares

D．being compared

Tom looked at Jenny, with tears ________ his eyes, and shouted out the words ________ in his heart for years．

A．filling; having been hidden

B．filled; hidden

C．filling; hidden

D．filled; hiding

After arriving in the United States, this 20-year-old Chinese student found it rather difficult to ________ living on his own．

A．rely on

B．adjust to

C．depend on

D．stick to

________ volleyball is her main focus, she’s also great at basketball．

A．Since

B．Once

C．Unless

D．While

Mary was much kinder to Jack than she was to the others, ________, of course, made all the others upset．

A．who

B．which

C．what

D．that

It’s important for the figures ________ regularly．

A．to be updated

B．to have been updated

C．to update

D．to have updated

It sounds like something is wrong with the car’s engine．________, we’d better take it to the garage immediately．

A．Otherwise

B．If not

C．If so

D．But for that