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第5题:
You must keep your course and speed
You may change course and speed as the other vessel must keep clear
The other vessel must keep her course and speed
Both vessels must keep their course and speed
第6题:
help you to keep your energy for the day's work
help you to control your temper early in the day
enable you to concentrate on your routine work
keep your energy cycle under control all day
第7题:
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第11题:
hold it in your hand
leave it in the hotel safe
put it in your front pocket
keep it in your shoulder bag
第12题: