—Would you like to go for a picnic with us?—_____, but I’m too busy.
--- Do you know whether scientists have ________a good way to deal with Influenza H7N9 or not? ---Not yet .But they’re trying their best.
The sports meeting will continue _______it rains this afternoon.
---How much do I have to ____you? I think it's a bit expensive. --- I don’t think so . It’s only three hundred pounds.
I didn’t know which bag was better than the other, so I took them________.
The teacher can _________believe that Tom studies so ________.