假如你是Betty，请给你的朋友Sam发email告诉他你们上周末去郊游的情况。
要求：60词左右；条理清楚；层次分明；下列词语供选用：last weekend, go on a school tr ip, climb the Great Wall , start, arrive at, return home, have a picnic, see many wild flowers and green trees, be tired, be happy
Last weekend we went on a school trip. We went to the Great Wall. We started at 7:00 in the morning and arrived there at 9:00. While we climbed the Great Wall, we saw many wild flower s and green trees. On the top of the Great Wall there was a beautiful view. We had a picnic there and we shared each other's food. We w ere very tired but we're very happy.
祝你学习进步！