Could you go to buy some drinks—____. I am busy washing the clothes.

Now China is fighting against illegal cooking oil（地沟油）, a kind of waste oil _____can cause a lot of illness.

He tried to _______ his teachers by using big words in all his essays.

___________ you eat, ______________you will be.

(2013·哈师大附中高三二模)If only I ________ more confidence in the English speech contest held last week!