Please remember not to speak _______ in the reading room. 

---If there are _______ people driving, there will be _______ air pollution.---Yes, the air will be fresher.

Of all the clothes stores, you can buy clothes _________in Dream Clothes.

—Don’t walk so fast. You must cross the road as _________as possible. —OK.I will.

--You speak English so well. ______ have you learned English? --For 5 years.