We won’t start the work until all the preparations _________.
Onethird of the area__________covered with green trees.About seventy percent of the trees__________been planted.
Sarah had her washing machine repaired the day before yesterday, ____ she?[ ]
Johnson is indeed a wise man.— Oh, yes. How often I have regretted _____ his advice!
He suggests the number of cars should be limited to stop air pollution.— __________, the idea is not very practical.
