It is these poisonous products ________ can cause the sympathetic of the flu, such as headache and aching muscles．

A．who

B．that

C．how

D．what

He is sure to come．I've ________ him to attend our meeting．

A．advised

B．tried to persuade

C．persuaded

D．suggested

It was about 600 years ago ________ the first clock with a face and an hour hand was made．

A．that

B．until

C．before

D．when

－Could I ask you a rather personal question?

－________．

A．Yes, don't worry

B．Of course, go ahead

C．Yes, help yourself

D．Of course, why not

I do every single bit of housework ________ my husband Bob just does dishes now and then．

A．since

B．while

C．when

D．as

The forest guards often find campfires that have not been ________ completely．

A．turned down

B．put out

C．put away

D．turned over

Please tell me how the accident ________．I am still in the dark．

A．came by

B．came upon

C．came to

D．came about

Cars do cause us some health problems－in fact far more serious ________ than mobile phones do．

A．one

B．ones

C．it

D．those

What a table!I've never seen such a thing before．It is ________ it is long．

A．half not as wide as

B．wide not as half as

C．not half as wide as

D．as wide as not half

At a rough estimate, Nigeria is ________ Great Britain．

A．three times the size as

B．the size three times of

C．three times as the size of

D．three times the size of