21. I sent Jack a letter , his photo　 _________ .

　 A. include　　　 B. included　　　 C. was included　　 D. including

请根据下表内容，以“保护树木”为题，用英语写一篇100词左右的短文。

主题:保护树木

现状:大量树木被乱砍滥伐

原因:人们需要木材和农田

后果:许多动植物消失；土地沙漠化且不能长庄稼；气候异常；生活环境恶化；人类将受到大自然的惩罚。

建议:保护树木、多植树

85. Good morning is formal, but Hi is very _______(非正式的).

84.Trains are fast and _______(方便).

83.This bus is ______(连接)to electric wires.

82.By the year 2000,housewives will probably have a robot ________(形状)like a box.

81.To get rid of garbage problems , the city will ______(装载)huge spaceships with waste materials

80. A______ was a sign of being part of the community, and of equality between actors and audience.