Some birds fly_______________in winter and some stay in the north.
| A．south | B．the south | C．in the south | D．to south |
He was passionately addicted to ________ to pop music.
| A．listen | B．listens |
| C．listened | D．listening |
Don't ________ your troubles too often.
| A．speak | B．tell |
| C．air | D．ask |
The incomes of skilled workers went up. __________，unskilled workers saw their earnings fall.
| A．Moreover | B．Therefore |
| C．Meanwhile | D．Otherwise |
________ all of them are strong candidates, only one will be chosen for the post.
| A．Since | B．While |
| C．If | D．As |
Nowadays people are more concerned about the environment __________ they live.
| A．what | B．which |
| C．when | D．where |