They are doing some very important ( ) (work)
the volunteers are doing difficult and important work,they s
Are they very important for you?
They work we are doing is(
They are doing some English _(练习).
what an important work the scentists are doing
Computer become very important because they can work faster
Computers are very important .They are ------ by most people
the volunteers are doing___ important work;they share___comm
Forests are very important to us ,aren't they?
英语翻译habits.They are very important for our health.
Forests are very important because they provide us with fres
they are doing better there work 请问用哪个介词,