How I wish I could bring some laughter to my students who ________ so hard．

will work

had worked

have been working

were working

Ever since Picasso’s painting went on exhibit, there ________ large crowds at the museum every day．

is

has been

have been

are being

In the country, about 30％ of the land ________ yet．

hasn’t been farmed

haven’t been farmed

has already farmed

have already farmed

Would you like to ________ us in our discussion?

take part in

join

taking part in

joining

________ your help, everything in the room is in good order now．

Since

Because

Thanks for

Thanks to

We have spent ________ money on English books．

a great deal of

a good many

a plenty of

a number of

She looks forward every spring to ________ the flower-lined garden．

visit

paying a visit

walk in

walking in

The school ________ three hundred pupils; now there are double that number．

started of

started with

started to

started

Some students, who are addicted ________ the computer games, do not go to school at all．

to play

playing

to playing

with playing

The government has promised to ________ on the energy crisis(危机)．

take place

take turns

take action

take part