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

______hashetaughtEnglishinthisschool?—Fortwoyears.[ ]

Where is London? I have a pen pal there. —It’s ________ England.[ ]

If he takes on this work, he will have no choice but ______ an even greater challenge.＿

I really don’t know____I had my walet stolen.