Complete each of the following sentences with the appropriate from of the word given in brackets.
4.The air around the earth is a _____ of mainly oxygen and nitrogen.(mix)
5.Information theory is primarily a _____ study.(theory)
9.The designer suggests we have a curtain to the_____ light.(softness)
10.As a_____ story writer,the wrote many wonderful stories popular among children.(fancy)
14.He gave me a _____ for a new house,which was too high.(quote)
15.I am very _____ to you for having given me so much help.(gratitude)
19.She_____ a few words on the paper and no one could work out what she meant by that.(scrawl)
20.He is a brilliant professor but has his_____ as an administrator.(limit)