—Iwonder why he has been acting so strange these days．
—Recent pressure at work may his behavior．
| A．account for | B．make for | C．change for | D．stand for |
The discussion ________ alive when an interesting topic was brought in.
| A．was coming | B．had come | C．has come | D．came |
The teacher, with 6 girls and 8 boys of her class, ________ visiting a museum when the earthquake struck.
| A．was | B．were | C．had been | D．would be |
Now that she is out of a job, Lucy ________ going back to school, but she hasn’t decided yet.
| A．had considered | B．has been considering |
| C．considered | D．is going to consider |
—What’s that terrible noise?
—The neighbors ________ for a party.
| A．have prepared | B．are preparing | C．prepare | D．will prepare |
—Has Sam finished his homework today?
—I have no idea. He ________ it this morning.
| A．did | B．has done | C．was doing | D．had done |