He rushed out of the burning house with the little boy in his arms ____________ the roof fell down and the boy was saved.
| A．after | B．as | C．before | D．until |
--- Who broke the window? --- I _____.
| A．had | B．broke | C．was | D．did |
It _____ them $300 a year to run a car.
| A．spends | B．costs | C．takes | D．pays |
Much _____ to be settled.
| A．remains | B．remembers | C．forgets | D．leaves |
It would be _____ a risk to let the child go to school by himself.
| A．running | B．following | C．passing | D．carrying |
He _____ the cooking yesterday.
| A．did | B．made | C．took | D．had |