按要求完成下列句子　另加分.1、We call maths the language of science.(改为被动句

按要求完成下列句子　另加分.
1、We call maths the language of science.(改为被动句）
Maths _______ the language of science
2、You can borrow two books at a time（改为被动句）
Two books _______ at a time.
3、Where did they plant trees?(改为被动句）
Where _____ trees ______?
4、 We will give a birthday party tomorrow.（改为被动句）
A birthday party ________ tomorrow
5、 Can another way be thought of to keep your wine or water warm?（改为主动句）
Can ________ another way to keep your wine or water warm?
6、Too many trees are sill being cut down in the USA.(改为主动句）
________are still ——————————down too many trees in the USA
7、John was seen to cross the street just now by someone.(改为主动句）
Someone_________John _______ the street just now