句型转换！急急急！！！

16．The headmaster has been to New Zealand only once．（对划线部分提问）
How many tims has the headmaster been to New Zealand？
17．She usually comes to see her grandma once a week．（对划线部分提问）
How often does she usually come to see her grandma？
18．We call maths the language of science．（改为被动语态）
Maths is called the language of science．
19．My teacher told me to try it again．（对划线部分提问）
What did your teacher tell you to do？
20．She gave me some French stamps this morning.（改为被动语态）
Some French stamps were given to me this morning.
21．They were all saved by the clever cat.（改为主动语态）
The clever cat saved all of them .
22．Both he and I are going to the concert tonight.（改为否定句）
Neither he nor I am going to the concert tonight.
23．I don't believe she can work out the problem.（改为反意疑问句）
I don't believe she can work out the problem，can she？
24．The students had a wonderful time in the park．（改为反意疑问句）
The students had a wonderful time in the park，haven't them ？
25．The small country has a population of more than 56，980，000．（对划线部分提问）
What's the population of the small country？
26．She said to me，“I will buy a used car because it is much cheaper．”（改写为含有宾语从句的复合句）
She told me that she would buy a used car because it was much cheaper．
27．I think to work as a doctor is interesting．（用it改写）
I think it interesting to work as a doctor．
28．My mother always goes shopping on Sundays．（改为否定句）
My mother seldom goes shopping on Sundays．
29．He will come back in a week．（对划线部分提问）
How soon will he come back？
30．The trees are growing well．The teachers planted them two years ago．（合并为含有定语从句的复合句）
The trees that the teachers planted
31．My uncle gave me a bike and I like it．（改写为含有定语从句的复合句）
I like the bike which my uncle bought me
32．I think his daughter must be a student．（改为反意疑问句）
I think his daughter must be a student，must't her？
33．She became ill because it was too cold．（改为简单句）
She became ill because of the cold weather．
34．She is a woman doctor．（改为复数句）
They're womendoctors．
35．It's about two kilometres from our school to the railway station．（对划线部分提问）
How far is it from your school to the railway station？

也不难啊 是家庭做业吧

1.Who
gave
2.since,
ago
3.lucky
enough
5.if
I
were
6.where
to
7.Where
did
8.or,
late
9.How
many
times
have
10.I
would
not