—When did you come back?
—An hour ago. You the computer games.
| A．have played | B．were playing | C．played | D．had played |
-Have you __________ how much the trip will cost?
-I'm working on it; just have a little patience.
| A．added to |
| B．counted on |
| C．added up to |
| D．figured out |
The news shocked the public，__________ to great concern about students' safety at school.
| A．having led |
| B．led |
| C．leading |
| D．to lead |
Plastic bags are provided for our convenience but they have also __________ the pollution of the environment.
| A．referred to |
| B．led to |
| C．reacted to |
| D．attended to |
Look over there-there's a very long, winding path __________ up to the house.
| A．leading |
| B．leads |
| C．led |
| D．to lead |
The printer is of good quality. _____ it break down within the first year, we would repair it at our expense.
| A．Would | B．Could | C．Might | D．Should |