Excuse me, can I take a seat here?—. Thewoman who sat here will be back soon.A．Yes, please.

－What do you think is the _________ of mobile phones, Peter －I think it’s very convenient for us to keep in touch with each other at any time.

no one has______convincing evidence of why dinosaurs died out,and it remains a mystery.

Our manager ________ for Shanghai in a few days and he has asked me to find out when the earliest plane ________ next Wednesday

I often play ping-pong_______ my classmates after class.