--The river used to be clean. How does it become dirty?
-- There are many factories ________ waste water into it.
A. pouring B. pour C. poured
- You look_______. What's up, sir?
- I can't find my ticket, but it's time to check in.
| A．sleepy | B．hungry |
| C．excited | D．worried |
Tiger Watch, _______ one-hour documentary, won_______ award for its amazing photography.
| A．an; an | B．the; a |
| C．a; an | D．an; the |
He’s good ___ swimming．Swimming is good ____ his health.
| A．for，at | B．at，for |
| C．for，for | D．at，at |
_“_____ do you live in that small town?”
_“For ten years.”
| A．What time | B．How long |
| C．How often | D．How soon |
Did you find the answer_____ the question about _____ TV very interesting?
| A．to, watching | B．of, watching |
| C．to, watched | D．of, watched |