An idea ________ to me that I might work out the maths problem in another way．

A．struck

B．happened

C．thought

D．occurred

________ some people stay here for a short break, others have decided to stay forever．

A．Because

B．If

C．Once

D．While

Lucy's dress looked just the same as mine, but the price is ________ mine．

A．as much twice as

B．twice as much as

C．much as twice as

D．as twice much as

The teacher together with the students ________ discussing Reading Skills that ________ newly published in America．

A．are; were

B．is; were

C．are; was

D．is; was

In the near future, more advances in the robot technology ________ by scientists．

A．are making

B．are made

C．will make

D．will be made

George was responsible for the accident because he didn't give a ________ to other drivers．

A．notice

B．mark

C．symbol

D．signal

________ ancient Olympic Games began around the year 776 BC in ________ Greece．

A．An; the

B．An;/

C．The;/

D．/; the

Mr．Smith didn't understand ________ made his son so upset that evening．

A．what was it

B．why it was this

C．how that was

D．what it was that

Tom ________ in the library every night over the last three months．

A．works

B．worked

C．has been working

D．had been working

Although cats can not see in complete darkness, their eyes are much more ________ to light than human eyes．

A．brilliant

B．attractive

C．available

D．sensitive