21. The children lost in the woods; otherwise, they would have been at the lakeside camp as scheduled.
| A．must have got |
| B．must get |
| C．should have got |
| D．should get |
You’ve missed your ______ to speak and you have to wait for another round.
| A．turn | B．chance | C．order | D．opportunity |
More and more people choose to shop in a supermarket as it offers a great ______ of goods.
| A．variety | B．mixture | C．attention | D．kind |
Though bought ten years ago,the car is still in good ______.
| A．situation | B．condition | C．position | D．station |
You must try some of her home-made wine.It’s quite an unforgettable ______.
| A．experiment | B．experience | C．effort | D．skill |
They hand down the custom from generation to generation to keep their ______ of life alive.
| A．way | B．method | C．means | D．form |