36. ________ is believed that the better–known companies spend about 70 percent of the total cost of the product itself on packaging!
He traveled to many mountain villages and saw many poor children out of school. This experience ___________ his life.
I should very much like to have gone to the party but I _________.
My dictionary _________, I have looked for it everywhere but still ________ it.
The students ________ busily when Miss Brown went to get a book she ______ in the office.
By _____, water can be changed into gas.