___students will take part in the sports meeting and _____them is over three hundred.

Ann, _____ the lights when you leave the classroom.

I don’t think teenagers should drive cars. – ____.They aren’t serious enough.

Do you mind opening the windowthe air inside is not so fresh.— __________, Mr. Smith is taking a nap (小睡)，don’t make him catch a cold.

(2013·湖北卷)While intelligent people can often________the complex，a fool is more likely to complicate the simple