His father, who is said to be teaching in Australia, ________ in Nanjing University for more than 10 years．

has worked

had worked

worked

has been working

Though the book is a little expensive, it is ________．

very worth buying

well worth to be bought

well worth buying

very worthy buying

It is required that students ________ mobile phones at school, so seldom ________ them using one．

don’t use; will you see

should not use; you will see

not use; will you see

can’t use; will you see

Don’t all stand up together! ________, please．

Each at one time

One at a time

One by one time

One for each time

________ from space, the earth, with water ________ seventy percent of its surface looks like a blue ball．

Seen; covered

Seen; covering

Seeing; covered

Seeing; covering

Roads in this mountain area used to be ________; people found it hard to travel here．

in poor conditions

in good condition

in poor condition

in a poor condition

On May 30th, 2010, at ________ World Table Tennis Championship, Ma Lin and Zhang Joke won the gold medal in men’s with ________ score of 3∶1．

a; a

/; the

a;/

the; a

With so much work ________ his mind, he almost broke down．

fill

filling

filled

to fill

To lose weight, Jane is considering ________ the weight-loss pills．She prefers to do that rather than ________ some exercise every day．

taking, take

taking, takes

take, taking

to take, take

By the end of last month, we had sold ________ as we did last year．

as twice many cups

twice cups as many

twice as many cups

as many cups twice