Onethird of the area__________covered with green trees.About seventy percent of the trees__________been planted.
The engineers made two big plans for the dam, ____ was never put in force.
——What do you think of the concert? ——I really enjoy it. I didn’t expect it was ____ wonderful.
——Tom, you are caught late again. ——Oh, ____.
____ the temperature might drop, coal was prepared for warming.
——We must thank you for taking the trouble to cook us a meal. ——____.