________ at the result, the boss left without saying any word.
| A．Having disappointed | B．Disappointing |
| C．To be disappointed | D．Disappointed |
I_______ such a foolish mistake if I had been a little more careful.
| A．wouldn’t make | B．wouldn’t have made |
| C．hadn’t made | D．didn’t make |
Look over there—there’s a very long, winding path _____ up to the house.
| A．leading | B．leads | C．led | D．to lead |
I was out of town at the time, so I don’t know exactly how it _______.
| A．was happening | B．happened | C．happens | D．has happened |
So sudden ________ that the enemy had no time to escape.
| A．did the attack | B．the attack did | C．was the attack | D．the attack was |
Occasions are quite rare ____ I have the time to spend a day with my kids.
| A．who | B．which | C．why | D．when |