I don't know who invented ________ iphone,but I think it is ________ useful invention.
Could I use your mobile phone now?— Yes, of course you .
The millionaire passed away, leaving his children with a large ________.
– What shall we have for dinner tonight? – Oh, I don’t care.________ will do.
What the children in the poor mountain village need ________ textbooks.
I don’t think Richard could have done such a stupid thing last night, ________?