What are you doing?—I’m _________ the Internet.

I hear the plane of MH370 has been found!—Really？I wonder if some people are still alive.

Yesterday Tony bought a scooter ______ 150 yuan.[ ]

I want to know if I can smoke here?—No, you _________. Could you see the sign “NO SMOKING” there?

You’re dropped __________ “s” in the word “across”.－Oh, you are right, __________ letter “s” should be doubled like this “cross”.