We should all remember that some great scientific discoveries _____________ by chance.
| A．gained | B．discovered | C．occurred | D．earned |
Those houses are sold at such a low price _________ people expected.
| A．like | B．that | C．as | D．which |
Though we are not walking slowly, I still think that it won’t be _________ he _________up with us.
| A．long before; catches | B．before long; catches |
| C．for long; caught | D．long until; will catch |
With all his money, he _________ worry about a little thing like 5 cents!
| A．can | B．must | C．may | D．should |
—That must have been a long trip.
—Yeah, it _________ us a whole week to get there.
| A．takes | B．has taken | C．took | D．was taking |
I was just talking to Margot when Jackson _________.
| A．cut in | B．cut down | C．cut out | D．cut up |