向高手请教几道英语的解释句子（同义句转换）谢谢啦！

11. It is important that we should control the growth of population.
控制人口增长很重要。

12. Mr.White was absent from the meaning yesterday.
怀特先生昨天会议缺席了。

13. How much does a one-way ticket cost from Shenzhen to Beijing?
深圳到北京去一日游的票价是多少？

14. I am not sure when I should start.
我不知道什么时候开始比较好。

15. They are good friends.
他们是好友。

16. What a clever boy Jim is!
吉姆真是个机灵的小子！

17. Jack was here a moment ago.
杰克刚才还在这儿。

18. The student followed the teacher carefully in class.
学生们在课堂上认真仔细地跟着老师做。

19. Summer follows spring.
夏天跟在春天之后而来。

20. “Does the horse run faster than the donkey?”Tom asked the teacher.
汤姆问他老师：“马有没有跑得比驴子快？”

we don't have any solution to stop the population growth
Mr.White didn't present the meeting yesterday.
what's the price of the one way ticket from Shenzhen to Beijing?
it's not scheduled yet when I should start.
they are close friends.
how clever Jim is
Jack just left
the students concentrate on the class.
spring is followed by the summer.
Tom asked the teacher if the hours runs faster than the donkey

15 They are crony
16How cleverly Jim is !
17Jack was here just