Not until I dropped off from school ____ how much time I had wasted.
| A．didn't I realize | B．did I realize |
| C．I didn't realize | D．I realized |
Harry’s been driving all day----- he be tired.
| A．need | B．can | C．shall | D．must |
Unfortunately I was sitting at the table with smokers on side of me.
| A．either | B．both |
| C．other | D．all |
_____ my cousin is very young, _____ she can help with the housework.
| A．Once; 不填 | B．Though; but |
| C．Although; 不填 | D．不填；不填 |
—What did you do on Earth Day this year?
—We _____ a show to spread the message about protecting the environment.
| A．put on | B．put up |
| C．put away | D．put |
—_____ does your father go to the fitness center?
—He exercises there twice a week.
| A．How soon | B．How often |
| C．How long | D．How far |