Correct the sentences if necessary

Ex7. Correct the sentences if necessary. Check (√) any that are already correct:
1. 20 percent of the forest have been destroyed lately.
=> _____________________________________________________________
2. The witnesses saw that most of the fire in the hills was extinguished.
=> _____________________________________________________________
3. Some of the animals from the zoo was released into the animal spreserve.
=> _____________________________________________________________
4. All of the students in the class taught by Professor Roberts is required to turn in their
term papers next Monday.
=> _____________________________________________________________
5. Half of the food that we are serving to the guests are still in there frigerator.
=> _____________________________________________________________
6. We believe that some of the employees is going to be devoted to quality control.
=> _____________________________________________________________
7. It is impossible to believe that somebody actually admire that man.
=> _____________________________________________________________
8. Each of the doctors in the building needs to have a separate reception area.
=> _____________________________________________________________
9. The president felt that no one were better suited for the position of chief staff advisor.
=> _____________________________________________________________
10. Everybody participating in the fund-raiser are to turn in the tickets by 8.00.
=> _____________________________________________________________