It's too hot.______I swim in the lake?
No, you _______. That's too dangerous!( )
A.Should; can'tB.Need; mustn't
C.Must; needn'tD.Could; can't
Please turn to page _________ and look at the __________picture in this unit.
Their school has more than two _____ teachers and _____ students.
China has opened its _______Antarctic research base (南极科考站) – the Taishan Station.
She is a _____ girl with two big eyes.
Nowadays _________ of business letters are written in English . A. two thirds B. two third C. two three