The government should develop ________ system to predict when wildfires occur and give warnings in time．

A．previous

B．responsible

C．reasonable

D．reliable

Good news! The price of all those second-hand goods is ________ before．

A．30％ as lower as

B．30％ lower than

C．lower 30％ than

D．as 30％ low as

Much ________ he has a good taste for China's football matches, he can't avoid being influenced by the side effects of the football gambling．

A．that he claims

B．does he claim

C．is it that he claims

D．as he claims

Once new difficulties ________ in your work, it's always important to use your brains．

A．raise

B．arise

C．arouse

D．rise

On Sundays there were a lot of children playing in the park, ________ parents sitting together joking．

A．their

B．whose

C．which

D．that

Can you make a sentence to ________ the meaning of the phrase?

A．show off

B．turn out

C．bring out

D．take in．

Everything comes with ________ price; there is no such ________ thing as free lunch in the world．

A．a; a

B．the;/

C．the; a

D．a;/

________ that they may eventually reduce the amount of labor needed on construction sites by 90 per-cent．

A．Such construction robots are clever

B．So clever the construction robots are

C．So clever are the construction robots

D．Such clever construction robots are

I get the two of them mixed up ________; they are so similar．

A．at one time

B．at no time

C．in no time

D．all the time

It is said that people are ________ likely to tell lies over the phone as they are in emails．

A．as twice

B．twice as

C．twice more

D．twice than