_______ the boy was walking down the street, the UFO landed.
| A．While | B．After | C．Before | D．until |
Peter’s teacher was very happy because he made the _____ mistakes in this exam.
| A．little | B．least | C．few | D．fewest |
Our classroom is on the _____ floor. We can hear the students singing on the fourth floor.
| A．fifth | B．five | C．three | D．Twelfth |
People like eating _____ very much. They are called “apples under the ground”.
| A．tomatoes | B．potatoes | C．pears | D．Bananas |
The Xisha Islands are _____ South China Sea. They belong to China.
| A．to | B．at | C．in | D．on |
_____ useful advice it is！
| A．What a | B．What | C．How | D．What an |