三级B 2018.12We should be ________ of cultural differences while doing foreign trade.
A. aware
B. active
C. friendly
D. hopeful
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三级B 2018.12This study has found some key factors _________ employees’ stress in their work.
A. turning down
B. leading to
C. taking off
D. carrying out
三级B 2018.12The company can now focus its attention ________ developing its latest car model.
A. in
B. with
C. at
D. on
三级B 2018.12If Mary had ________ the situation to Tom, he would have understood it.
A. supplied
B. explained
C. charged
D. thrown
三级B 2018.12I’m pleased to receive your letter of April 10th,________ for our catalogue and price-list.
A. ask
B. asked
C. to ask
D. asking