—Who______ it be that is knocking at the door?
—It ______ be Father, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |
The incomes of skilled workers went up.________，unskilled workers saw their earnings fall.
| A．Moreover | B．Therefore | C．Meanwhile | D．Otherwise |
If he________his legs in the last training，he________the coming World Cup，which he has been longing to compete in.
| A．hadn’t hurt；would join in | B．hadn’t hurt；would have taken part in |
| C．didn’t hurt；would go in for | D．didn’t hurt；would have taken part in |
The price in different countries will be based________and local economic conditions.
| A．in advance | B．in conclusion | C．on demand | D．at all costs |
It was a long time before the police________what he was really doing.
| A．caught hold of | B．caught up | C．caught on to | D．caught at |
Lan Lan _______her pace of walking home fearing that it was going to rain.
| A．accelerated | B．slowed | C．stopped | D．returned |