But for their common efforts, they achieved so much in their research.
| A．could have |
| B．will not have |
| C．could not have |
| D．have not |
---Joan was badly injured in the accident yesterday and she was sent to hospital.
---Oh, really? I______. I ______ visit her.
| A．didn’t know; will go to |
| B．don’t know; will go to |
| C．didn’t know; am going to |
| D．haven’t known; am going to |
With more forests being destroyed, huge quantities of good earth ______ each year.
| A．is washing away | B．is being washed away |
| C．are washing away | D．are being washed away |
_______the Internet is bridging the distance between people, it may also be breaking some home or will cause other family problems.
| A．When | B．While | C．If | D．As |
_______ in my life impressed me so deeply as my first visit to the Palace Museum.
| A．Anything | B．Nothing |
| C．Everything | D．Something |
Helping others is a habit, _______ you can learn even at an early age.
| A．it | B．that | C．what | D．one |