______the doors were closed and that all the lights were off, the boy left the classroom.
| A．Check | B．To check | C．Checked | D．Having checked |
I’m feeling sick. I __________so much chocolate.
| A．needn’t have eaten | B．couldn’t have eaten |
| C．mustn’t have eaten | D．shouldn’t have eaten |
. More patients in hospital this year than last year.
| A．treated | B．have treated | C．had been treated | D．have been treated |
— What are you going to do this afternoon?
— I’ll probably go for a walk later on __________ it stays fine.
| A．as far as | B．so long as | C．even if | D．as if |
— How do you deal with the disagreement between the company and the customers?
— The key __________ the problem is to meet the demand __________ by the customers.
| A．to solving; making | B．to solving; made |
| C．to solve; making | D．to solve; made |
She tried hard to keep calm in face of the students, but the sweat on her forehead ________ her __________.
| A．gave; away | B．turned; down | C．showed; out | D．shut; off |