________ more time, we could have done the job better．

Give

Giving

To give

Given

________ is the percentage of the population who own their own homes?

How

What

How much

How many

More and more people choose to shop in a supermarket as it offers a great ________ of goods．

variety

mixture

extension

combination

The custom of arranged marriage still ________ in many countries．

appears

lays

exists

shows

Zhang Juanjuan ________ South Korean defending champion to win the individual archery gold medal．

beat

defeat

hit

won

Because of the heavy fog, the flight to Shanghai will have to be ________．

taken off

got off

put off

cut off

China sent up two manned spaceships and they were also great scientific ________ in the world．

achievements

discoveries

surprises

projects

As far as I know, the positive and lively activities ________ our students, who used to focus on just remembering knowledge, to use their knowledge freely．

motivate

motivated

have motivated

had motivated

E-mail, as well as telephones, ________ an important part in daily communication．

is playing

have played

are playing

play

We ________ last night, but we went to the concert instead．

must have studied

might study

should have studied

would study．