15. It's already 10 o' clock. I wonder how it_________ that she was two hours late on such a short trip..
We can buy things ___ the Internet.
There ___ a foreign concert this evening.
—Must I take my umbrella? —No,you ___. It’s not going to rain.
Yesterday I asked him ___ me ___ my English.
He usually goes out for a walk ___ watching TV at home.