that they may eventually reduce the amount of labor needed on construction sites by 90 percent．
| A．Such construction robots are clever |
| B．So clever the construction robots are |
| C．Such clever construction robots are |
| D．So clever are the construction robots |
China _______ a sharp increase in the number of aged people over the past decade.
| A．sees | B．saw | C．has seen | D．will see |
Mr. Frank asked me a question _______ I could go with him to _______ he called the Treasure House the next week.
| A．that; which | B．whether; that | C．whether; what | D．that; where |
—The terrible accident is under investigation.
—Actually, quicker action ______ those workers trapped in the mine.
| A．might have saved | B．must have saved | C．should have saved | D．could have saved |
— Why didn’t you try to finish the composition?
— I tried to , but I could, the bell rang announcing the end of the examination time.
| A．until | B．when | C．before | D．after |
—I don’t have any change with me. Will you pay the bill for me?
—______.
| A．That’s fine | B．Nothing serious | C．No problem | D．Never mind |