求这些英语题答案。。。

(1) It +be +adj. +to +do
学好英语是重要的.
It is important to learn English.
(2) It +is +n. +to + do
制定这样一个计划是件怪事.
It is a strange thing to make such a plan.
(3) It takes sb. sometime to do sth.
搞这样一个设计花了我一年的时间.
It took me a year to make the design.
It’s your turn.
It’s one’s turn 是按次序轮到某人了.经常构成的句型是:it’s your turn to do sth.
轮到你发言 It is your turn to speak.
轮到我们值日了 It is our turn to be on duty.
联想:动词词组take turns 表示“依次、轮流”其后跟动词不定式。
大聚会上，大家必须轮流唱一支歌。
Everyone att the party must take turn to sing.
Step 4 当堂练习
单项选择
（ D ）1.They haven’t packed anything
A. already B. then C. at that time D. yet
( C )2.____teenages like pop music and look forward to pop singers.
A. Mostly; meeting B.Most of; see
C. Most; meeting D.Most of; seeing
( B )3.In the last few days they ready for the concert.
A.have got B.got C.are D.are getting
( D )4.A or a man is useful when you go on a tour.
A.radio B.ticket C.towel D.guidebook
( C )5. beautiful music makes the fans execited.
A.SO B.So a C.Such D.Such a
希望正确。