____ some teenagers don’t realize is ____ difficult life can be after they get addicted to drugs.
| A．What；how | B．What；what | C．That；how | D．That；what |
-I saw Tom in the lift this afternoon.
-Really? He __________ around here for a long time.
| A．won't be seen | B．wasn't be seen |
| C．hasn't been seen | D．hadn't been seen |
The drunken men were last seen __________ in the bar.
| A．fighting | B．fought |
| C．fight | D．to fight |
They failed to finish the project before the deadline. I regretted __________.
| A．to be not able to help | B．being not able to help |
| C．being unable to help | D．not to be able to help |
If the rain keeps falling, it will __________ our whole plan.
| A．damage | B．harm |
| C．upset | D．ignore |
As is reported, the floods happening in Thailand __________ thousands of houses and killed many people.
| A．hurt | B．injured |
| C．destroyed | D．damaged |