________is it ________has made Peter ________he is today?
The seller would sell the shirt for ten yuan, but the customer ______ eight yuan.
With more forests being destroyed, huge quantities of good earth ______ each year.
What a pity! All his property, the books, the pictures and the house, ______ consumed by the big fire.
Professor Smith,along with his assistants, ______ on the project day and night to meet the deadline.
He has ______ the surroundings, and now he is getting well on with his classmates; ______ ,he is treated as a normal student in the school.