How did you manage to get to the school on time_________you missed the school bus?
| A．when | B．if |
| C．once | D．because |
He spoke so quickly that I didn't _____ what he said.
| A．receive | B．accept | C．take | D．catch |
Every time he tried to start the car, the wheels _____ deeper into the mud.
| A．stayed | B．sank | C．fell | D．dropped |
As the storm drew near, black clouds were _____ over the sky.
| A．smoothing | B．wandering | C．running | D．gathering |
The city was _____ to me, and I didn't know where to go.
| A．interesting | B．large | C．strange | D．exciting |
The book is not _____ what we paid.
| A．worth | B．valuable | C．cost | D．dear |