He packed his suitcase, ________ the door and rushed downstairs as fast as he could.
| A. locking | B. locked | C. having locked | D. having been locked |
Knowing they couldn’t understand what I had said, I gave several examples and ________ I got my idea across.
| A. eventually | B. occasionally | C. constantly | D. generally |
The missing children haven’t been found yet. Something terrible ________ to them.
| A. may happen | B. should have happened |
| C. must happen | D. might have happened |