Up till now, full use of this theory has been ________ in building large ocean-going ships.
| A．done | B．made | C．laid | D．taken |
The number of people invited _____ fifty, but a number of them ____ absent for different reasons.
| A．were; was | B．was; was | C．was; were | D．were; were |
The discovery of new evidence led to ______.
| A．the thief having caught | B．caught the thief |
| C．the thief’s being caught | D．the thief to be caught |
Having arrived at the station, _____.
| A．it was found that the train had left | B．the train had left |
| C．the train was found left | D．he found that the train had left |
He’s trained hard for the last two years. It is ______ he did so well at the track and field meet yesterday.
| A．no problem | B．no wonder | C．no doubt | D．no way |
By the time he realizes he ______ into a trap, it’ll be too late for him to do anything about it.
| A．walks | B．walked | C．has walked | D．had walked |