Many clothing manufacturers now substitute artificial silk _____ natural silk to cut down costs of production．
| A．with | B．by | C．for | D．of |
—He hasn’t finished the work yet. —Well, he _____.
| A．ought | B．ought to | C．ought to have | D．ought to have finished |
Be careful with such things. If you ____, you’ll drop them.
| A．don’t | B．aren’t | C．won’t | D．do |
—Are there any English story books for us students in the library?
—There are only a few, ____________.
| A．if any | B．if some | C．if have | D．if has |
—Alice, why didn’t you come yesterday? —I ___, but I had an unexpected visitor.
| A．had | B．would | C．was going to | D．did |
I remember my daughter used to ask some questions that girls ____ would ask.
| A．twice her age | B．twice so old as she |
| C．as twice old as her | D．twice as old as her old age |