Scientists also have no idea how long it will be before all wild animals in the cages _____.
| A．should be set free | B．will be set free |
| C．are set free | D．would be set free |
Since the recent river pollution in Shanxi Province , people ____ more and more attention to the water quality.
| A．pay | B．are paying | C．have paid | D．have been paying |
When I graduated from high school , my family had a business ____ I never thought about getting a college education.
| A．so | B．or | C．though | D．since |
—I have ____ splitting headache, too.
—Yeah, you’re definitely coming down with _____ flu.
| A．a; a | B．the; / | C．a; the | D．the ; a |
our manage objects to Tom's joining the club, we shall accept him as a member.
| A．Until | B．Unless | C．If | D．After |
Wind power is an ancient source of energy we may return in the near future.
| A．on which | B．by which | C．to which | D．from which |