7.(单选题,2分)Although John was the eldest in the family, he always let his sister () charge of the house.

19.(单选题, 2分)To raise people's()of the monarch butterfly, scientists have been doing researches on this wonderfulcreature.

18.(单选题, 2分)As government officers, we tried to()that everyone got a fair deal.

17.(单选题, 2分)They spent()(money on the new hospital.

16.(单选题, 2分)We can()ourselves because we have already been old enough.

15.(单选题, 2分)The()(of this kind of electric car is not high, and many young people can afford it.

14.(单选题, 2分) Guangzhou()( Flower City.

13.(单选题, 2分)She realised that one of the greatest()()the distance that usually exists between people.

12.(单选题, 2分)Maria cleans her room()to keep it().

11.(单选题, 2分)lt is reported that the new album will become()(for purchase in April of next year.

10.(单选题, 2分)()are my family. ()( are very friendly and I love ()very much.