--- ____is it from your home to school ?---It’s three kilometers.
The students are clever. They have no problems _____ out the math problem.
—Do the dishes,Tom, or I will tell Mom!--Mind your own_____,Mary!
I think this problem is much more difficult than that one,______?
Mother told me sound____slower than light.
—I have no idea____Mary will go shopping with us or not.–I don’t know,either.