___ is the most useful invention?
| A．Do you think which of these | B．Which of these you know |
| C．Which of these do you know | D．You know which of these |
He said French is the most beautiful language in the world and _____ he was determined to learn it well.
| A．／ | B．that | C．also | D．besides |
The Whites came here to buy some clothes and _____ on an old friend of theirs.
| A．call | B．for calling | C．calling | D．called |
—When will the train start？
—It _____ at 2:35 in the afternoon according to the timetable.
| A．starts | B．will start | C．would start | D．started |
—Would you lend me your pen for a while？
—Certainly. I _____.
| A．would | B．should | C．will | D．shall |
—I wonder if your wife will go to the ball.
—If your wife does, so _____ mine.
| A．is | B．do | C．does | D．will |