The maths problem is very difficult．I work it out, ________．

still

yet

although

though

He left his homeland, ________ never ________ back again．

determined; to come

being determined; to come

determined; coming

determining; coming

When ________ the twins, you will find the differences between them．

compared

compare

comparing

compares

________ is known to us is that tobacco contains nicotine and other harmful products, so you should give up smoking?

As

It

What

Which

Scientists say it may be five or six years ________ it is possible to test this medicine on human patients．

since

after

before

when

After many years hard work, the actress's career really ________．

took on

took off

took up

took out

What a pity!Considering his ability and experience, he ________ better．

need have done

must have done

could have done

might have done

The repairs cost a lot, but it is money well ________．

to spend

spent

being spent

spending

The football game comes to you ________ from New York．

lively

alive

live

living

Tom has no idea ________ he's going to be when he grows up．

what

that

as

which