It is _______ unusual thing for us to find ________ UFO.
He’s staying there _____ two weeks.
It’s _____ cold today. We have to stay at home.
----Can you come to my party ? ---- _____.
----- I don’t think waste water should be put into the rivers or lakes. ----_____.It will cause much water pollution.
--- Oh, Jack’s not here these days. Is he ill? ---________. His mother told me that he was in hospital.