When he fell off the bike, he tried ____ but couldn't .
| A．to have stood up | B．standing up | C．to stand up | D．having stood up |
The woman, when ______ how her husband was injured, began to cry.
| A．asked | B．to ask | C．asking | D．ask |
—Has Mr. Black decided not to take part in the party?
—Yes. But the reason______he refused the invitation is not clear.
| A．what | B．for which | C．with what | D．which |
Miss White, please keep visitors off the meeting-room. A secret plan______ there.
| A．is made | B．was made | C．is making | D．is being made |
People are deeply struck by Forrest Gump because of his unselfish ______ to helping others.
| A．invitation | B．expression | C．devotion | D．protection |
All the students______ laughter when David walked into the classroom like Donald Duck.
| A．broke up | B．broke out | C．burst out | D．burst into |