一、单句填空
1.All the preparations for the task (complete), and we are ready to start.
答案 have been completed
2.A survey of the opinions of experts (show)already that three hours of outdoor exercise a week (be) good for ones health.
答案 has shown;is
3.Students in Yucai Middle School each (be) going to do voluntary work during the coming summer holiday.
答案 are
4.One third of the country (cover)with trees and the majority of the citizens are black people.
答案 is covered
