—Which sweater can you choose, the blue one or the red one?—____ is OK, I think. Both go well with my trousers.
None of us _____ running, but we all like swimming.
He is tall, _____ his son is short.
What can we students do _____ the environment?
There are five people in the room, but I know _____.
—What did our geography teacher say? —She told us that the earth _____ around the sun.