英语选择,改写句子We should stop factories_______making unhealthy gas

英语选择,改写句子
We should stop factories_______making unhealthy gases.
A.from B.to C.in D.of
Jacky,_______ his twin brother,plays _______piano twice a week.
A.like,the B.like,/ C.likes,the D.likes,/
The youny lady found out where to buy cheap Mp3(句意相同）
The youny lady found out where she _______ _______cheap Mp3.
I don't know when we should leave for Nanjing.(句意相同)
I don't know when _______ _______ _______Nanjing.
I help the SPCA by _______ old towels and blanket _______the SPCA.
A.collecting,to B.collect,for C.collecting ,for D.collect,to
Gorge left Shanghai _______England _______a fine morning.
A.for,in B.for,on C.to,in D.to,on
Mr.Mark left Shanghai two months ago.（句意不变）
Mr.Make has _______ _______ from Shanghai two months ago.
第三句为什么是could buy