The elephant weighs ________ more than the panda.

—You look so worried, what’s wrong?—More and more people like me become to worry about the __________ pollution  after the haze (雾霾) appeared in Beijing and some other cities in China.

I bought aand a ruler in the shop.

Mary takes a lot of exercise every day and she is always full of_______.

—Do you have two_________? —Yes , I do.