All of us are pleased to see the problem ______ so quickly．
| A．solve | B．solving |
| C．to solve | D．solved |
He has to finish the experiment today. He must be in the lab, ______?
| A．mustn’t he | B．won’t he | C．doesn’t he | D．isn’t he |
Not far from the school there was a garden, _____ owner seated in it playing chess with his grandson every afternoon.
| A．its | B．whose | C．which | D．that |
Before us lies the biggest room, _____ with things like guns, dolls and old clothes.
| A．filling | B．filled |
| C．being filled | D．having been filled |
—What do you think of my plan？
—Sorry. What’s that? I_____ about something else.
| A．thought | B．am thinking |
| C．was thinking | D．had thought |
—Who won the election for mayor?
—A manto represent every minority group in the city.
| A．claims | B．is claimed | C．claimed | D．claiming |