We had to wait half an hour________ we had already booked a table.
| A．since | B．although | C．until | D．before |
The professor could hardly find sufficient grounds _____his arguments in favor of the new theory.
| A．to be based on | B．to base on | C．which to base on | D．on which to base |
Modern science and technology has __________ communication between people far apart.
| A．made convenient | B．made it convenient |
| C．made it convenient for | D．made it convenient to |
—I’m sorry, but the manager isn’t here yet. Shall I have him call you when he comes back?
—No, I’ll call him later. If I call again in half an hour, do you think he ____?
| A．arrives | B．has arrived | C．will arrive | D．will have arrived |
Classical novels often have ________ which add interest, tension, or deeper meaning to the text; mist is one in Great Expectations.
| A．lotus | B．privilege | C．syllables | D．symbols |
—I expected him to be nervous before his speech, but he was as cool as a cucumber.
—He _______ it carefully.
| A．could have prepared | B．shouldn’t have prepared |
| C．must have prepared | D．can’t have prepared |