He directed exposure to pigs,otherwise he_______pig flu.
| A．couldn’t get | B．wouldn’t have gotten | C．couldn’t have got | D．woud get |
The president stood by a window inside the room, ____, looking over the square.
| A．where I entered | B．into which I entered |
| C．which I entered | D．that I entered |
Many teens don’t get enough sleep because they have too much homework, which ____ them up at night.
| A．makes | B．breaks | C．turns | D．keeps |
As time went by, the plan stuck ____ fairly practical.
| A．to proved | B．to proving | C．proved | D．to be proved |
—You didn’t invite Mary to the ball?
—____ her, too?
| A．Must I invite | B．Should I have invited |
| C．Must I have invited | D．Should I invite |
It was believed that things would get worse, but ____ it is they are getting better.
| A．before | B．after | C．because | D．as |