1. People were so frightened to run about.
(about表示四处、四周,副词,用so...to 结构表示“由于..而”的意思)
2. I have learnt from the textbook that a lot of precious birds are facing the danger of dying out.
(面临危险face the danger,灭绝 die out,得知 learn sth.）
3. The tree leaves are everywhere in the late autumn.
(everywhere 遍地 晚秋 late autumn)
4. More and more birds are in danger because people are constantly invading the land.
(侵占 invade不断地 constantly越来越多 more and more处于危险中 in danger)
5. When the broken pieces of glasses and bricks fell down, people began to run about crazily.
(碎片 broken pieces掉下来 fall down四处逃窜 run about)