I remembered _____ the door before I left the office, but forgot to turn off the lights.
| A．locking | B．to lock | C．having locked | D．to have locked |
（2012江西卷）--Look! Somebody the sofa.
--Well, it wasn’t me. I didn’t do it.
| A．is cleaning | B．was cleaning | C．has cleaned | D．had cleaned |
（2013·辽宁卷)We are confident that the environmenr by our further efforts to reduce pollution
| A．had been improved | B．will be imroved | C．is improved | D．was improved |
Hard is feeling uncomfortable.He _____ too much at the party last night.
| A．could drink | B．should drink | C．would have drunk | D．must have drunk |
The water supply has been cut off temporarily because the workers ____ one of the main pipes.
| A．had repaired | B．have repaired | C．repaired | D．are repairing |
Hurry up, kids! The school bus _______ for us!
| A．waits | B．was waiting | C．waited | D．is waiting |