.When the environmentally friendly cars came onto the market, many people were eager to buy them ________ the price.
It was not until yesterday that I realized ____ silly mistakes I had made.
With mum’s birthday around the corner, I have taken some money out of the bank _____ a present for her.
—Everybody is going to climb the mountain. Can I go too, mum?—______. Wait till you are old enough, dear.
A proposal came up at the meeting _____the protection of giant pandas in Sichuan.
Grade Three students have a ______ to work harder than those in Grade Two.