解析：句意为：Tom在晚会上给我们讲故事、说笑话，让我们很高兴。entertain在句中用作及物动词，表示"使欢乐"。

　　答案：C

　　5．The villagehas been____________fromtheoutside world by the earthquake for two days.

　　A．cut up B．cut down

　　C．cut in D．cut off

　　解析：句意为：这个村庄因地震与外界已隔绝两天了。cut off隔绝，使断绝。cut up切碎；cut down切断；cut in插嘴，插话。

　　答案：D

　　6．John is so____________in the school that he sets a good example for all of us.

　　A．outstanding B．disturbing

　　C．frightening D．boring

　　解析：句意为：约翰在学校里是如此出色，他为我们大家树立了一个好榜样。outstanding突出的，杰出的，符合题意。disturbing引起烦恼的，令人不安的；frightening令人恐惧的；boring令人厌烦的。

　　答案：A

　　7．I'm afraid that I can't accept your argument，for you haven't offered enough____________evidences.

　　A．convinced B．convincing

　　C．confusing D．confused

　　解析：句意为：我恐怕不能接受你的论点，因为你没能提供足够的令人信服的证据。convincing (事物等)令人信服的，符合题意。convinced(人等)确信的；confusing(事物等)使人困惑的；confused(人等)困惑的，糊涂的。

　　答案：B

　　8．It has been a long time since he was lost.He was last seen____________with his friends at the top of the hill behind the village.

　　A．play B．to play

C．played D．playing