When did you first meet Tom?—The first day I came to this city，________，on May 2

Dad, I have been appointed as manager of our company, but I’m worried about it. —Why worry? Increased responsibility can ______ your best qualities.

Look at the smog(雾霾). _______ bad weather it is!

You should keep _____ while I take a photo of you. [ ]

China is a country with ________ resources.— That’s true. But China is also a country with the largest number of people.