There are eight tips in Dr.Roger's lecture on sleep，and one of them is：________ to bed early unless you think it is necessary.
| A．doesn't go | B．not to go |
| C．not going | D．don't go |
Not until I read your letter ________ the true state of the affairs.
| A．did I understand | B．had I understood |
| C．I understood | D．I had understood |
________ going to the program If You Are the One，she knew she had to be there or her mother would be unhappy.
| A．Although much she disliked |
| B．Much although she disliked |
| C．As she disliked much |
| D．Much as she disliked |
He ________ your car by mistake because he didn't have the keys.
| A．mustn't have taken | B．shouldn't have taken |
| C．couldn't have taken | D．needn't have taken |
Professor Tang didn't give us a speech today.It was ________ he had a traffic accident on the way to school.
| A．that | B．when | C．why | D．because |
She often shares her deepest thoughts and fears with friends through QQ, as if they ________ chatting in her living room.
| A．were | B．are |
| C．had been | D．has been |
I ________ him in time, otherwise he would have fallen off the bike.
| A．had supported | B．supported |
| C．have supported | D．support |
People love the convenience of bottled water, but if they ________ the problem it causes, they ________ try carrying water in a reusable steel container instead of plastic.
| A．realized; will | B．had realized; will |
| C．realized; would | D．have realized; would |
—How was your trip to Yancheng last week?
—Wonderful! I only felt sorry that I ________ the nature reserve of redcrowned cranes, but the weather was awful.
| A．could visit | B．could have visited |
| C．might visit | D．might have visited |
If I ________ your advice then, I think that the crops could be growing better.
| A．took | B．would have taken |
| C．had taken | D．have taken |