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 |
Eric helped to explain some things about community medicine to Barack, and of course his ideas were affected by Barack _____ health care.
| A．thought about | B．to think about | C．think about | D．thinking about |
In front of the Great Pyramid, Mr Lee stood _____ its great height, and asked many questions.
| A．to gaze up at | B．to gaze down at | C．gazing up at | D．gazing down at |
Mom believes that those words put to paper two centuries ago really _____ something.
| A．mean | B．represent | C．tell | D．say |
We know _____America is great not because it is perfect but because it can always be made better and _____ the unfinished work of perfecting the union falls to each of its citizens.
| A．不填；不填 | B．that ; that | C．that ; 不填 | D．不填；which |
If Doric continues doing things like that, he ______ face the music one day！
| A．can | B．should | C．would | D．shall |