---Why do you keep the windows open on such a cold day? ---There are so many students here, so we want to keep the air nice and __.
My father offered __________me to the zoo last weekend.
Li Hua’s shoes are as as Zhang Hui’s.
—What’s the __________of China? —More than 1.3 billion.
It’s too cold today. Tell him__________the window.
— Why don’t we go swimming tomorrow? — ___________ .