Taiwan is _____ the east of Fujian.[ ]

You see, “Food Safety” receives thousands of Internet hits a day.—Obviously, it has become one of the________ topics recently.

Where is Mr. Green now? I haven’t seen him for a few days —- He ________________ to Shanghai.

A lot of people will help you, so you _____________worry about the money.

My father is always busy __________ his work[ ]