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----A study suggests reducing energy demand in the future may _______ urban areas.

---That’s true. Cities need more energy than small towns or other rural areas.

A. center on B. act on C. hang on D. catch on

Tech-free tourism refers to traveling without a mobile phone or similar devices, particularly to places_____ block or cannot access Internet and cellular signals.

A. which B. where C. when D. who

A Chinese student’s print-like handwriting caused controversy among British Internet users, _____ both praise and questions about individuality.

A. having drawn B. drawing C. to draw D. drew

Some experts hold the view that fundamental construction is _____ the key to the little island development lies.

A. which B. what C. where D. why

Florida is blessed with ______ warm climate, which makes it _____ suitable place for old people to live in.

A. a; 不填 B. 不填; the C. a; a D. the; a

The machine has been used for man years. It’s no wonder that it doesn’t work well __________.

A. regularly B. constantly

C. frequently D. occasionally

Researchers are now conducting hibernation experiment and can use chemicals to put living cells into sleep-like state_____ they don’t age.

A. for which B. that C. where D. which

The newly-built subway is always crowded with passengers going home from market, most of them _____ heavy bags and baskets full of fruit and vegetables.

A. carried B. to be carried

C. to carry D. carrying

---The prices of vegetables are going up madly. It’s really too much for us.

---But for the situation where many vegetable producing areas _____ constant low temperature, things would not be like this.

A. meet with B. have met with

C. met with D. had met with

Do you still remember how many years ago_________ we first met on campus?

A. was it that B. it was that

C. was it when D. it was when