Some English questions ,急····

Some English questions ,急····
选出与划线部分相同意思的词语
1.—Are there a number of students canspeak french?
No,there aren't.(a number of 画线）
A .lots of B a lot C.many D much.
lots of 即可修饰不可数与可数,那many 和lots of 不都是可以一样的替换吗?那选择哪一个呢?
2.When are they getting back to our city
A.giving back B.back C.returning D.taking back
(对 getting back 画线提问）
Mary's babysitting her aunt's baby at home.
可化为Mary is babysitting her aunt's baby at home.那在这句中,Mary is 是可替换Mary's
There is a boy and a girl.
这句话是对的吧?是不是因为就近原则?
改为感叹句：Mike is working hard.
_____ ______ Mike is working.
改为同义句：We hope they can come here.
We _______ _______ to come here.

1.—Are there a number of students canspeak french?
No,there aren't.(a number of 画线）
A .lots of B a lot C.many D much.
问题：lots of 即可修饰不可数与可数,那many 和lots of 不都是可以一样的替换吗?那选择哪一个呢?
｛个人觉得都对的呀,如果硬要选,我选many｝
2.When are they getting back to our city
A.giving back B.back C.returning D.taking back
(对 getting back 画线提问）
问题：选择哪一个?告诉我理由好吗?
｛C get back to=return to回到 ；give back 归还；take back 拿回｝
Mary's babysitting her aunt's baby at home.
问题：这句话对不对?可化为Mary is babysitting her aunt's baby at home.那在这句中,Mary is 是可替换Mary's 是吗?
｛嗯,对的｝
There is a boy and a girl.
这句话是对的吧?是不是因为就近原则?
｛嗯｝
改为感叹句：Mike is working hard.
_HOw hard_ Mike is working.
改为同义句：We hope they can come here.
We hope them to come here.