. Her letters_____ the beautiful days when they lived in his hometown.
| A．call up | B．call for | C．call on | D．call at |
They were surprised that a child should work out the problem____ they themselves could not.
| A．once | B．unless | C．while | D．if |
We missed the beginning of the football match. When we got to the stadium, the match ______.
| A．would start | B．has started |
| C．had started | D．was starting |
The boy was very sick, but he managed to ______.
| A．pull off | B．pull out |
| C．pull through | D．pull up |
The following morning we left the hotel early and _____ for the beautiful lake in the city.
| A．headed | B．eyed | C．handed | D．housed |
John received an invitation to dinner, and with his work______, he gladly accepted it.
| A．finished | B．finishing |
| C．having finished | D．was finishing |