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

.Why __________ put the meat in the fridge ? It’ll stay fresh for several days.

Yang Liwei is the first man ________ the moon.

You’d better leave, because it’s dangerous here. [ ]

Dad, _____ is my friend , Xiao Hua. –Hello, Xiao Hua.