The keeper of the spring cleared away the leaves and branches, and wiped away the silt(淤泥) that would _______ have choked and polluted the fresh flow of water.
| A．thus | B．otherwise | C．therefore | D．later |
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 |
I _____ to him for what I said.
| A．excused | B．apologized | C．pardoned | D．explained |