______with so much trouble, we failed to complete the task on time.
| A．Face | B．Facing | C．Faced | D．To face |
“Have you seen _____ pen? I left it here this morning.” “Is it _____ black one? I found it in the corner.”
| A．a, the | B．the, the |
| C．a, a | D．the, a |
. He has changed a lot. He _______ not what he _______.
| A．is, is | B．was, was |
| C．is, was | D．was, is |
“It’s twelve o’clock, I think I must be off now.” “Oh, really？ I ______ it at all.”
| A．don’t realize | B．haven’t realized |
| C．didn’t realize | D．hadn’t realized |
“What’s her new telephone number？” “Oh, I _____.”
| A．forget | B．forgot |
| C．had forgotten | D．am forgetting |
“Oh it’s you！ I ________ you.” “I’ve had my hair cut.”
| A．didn’t realize | B．haven’t realized |
| C．didn’t recognize | D．don’t recognized |