—Did you know ______ just now?—Their plane didn't take off on time because of the thick fog.
His father is __________ engineer and he works __________ research.
---Which would you like to eat, bread or sandwiches? ---___________. Please give me some dumplings.
Picking apples is __________ than having class.
Tom ______________ playing compute games, doesn’t he?
__________, we’d bought a city map. We may get lost without it.