能答几道就几道The police requested the crowd to remain calm.The pol

The police requested the crowd to remain calm.
The police appealed to the crowd to remain calm.（同义句）
She might have accepted his invitation.
Possibly she could have accepted his invitation.(同义句)
全校师生对四川地震灾区的人民表现出巨大的关心和担忧
The whole school expressed their enormous concern and care for the people of the earthquake stricken area in Sichuan.
在四川毁灭性地震过后,政府部门呼吁群众不要惊慌,并及时组织力量抢救人员.
After the disaster of Sichuan earthquake,the government ministries appealed to the public not to panic.Prompt aid was instantly dispatched to the area.
这些防护林带保护了五十万英亩的农田不受流沙的侵袭
A line of over half a million seedling forest plants protected the farmlands from erosion.
年轻人的环境意识比他们的父母强
The youth are more aware of environmental protection than their parents.