Thomas does well in dancing. How about Bob— Bob is_____, I think. He once won the first prizein a dancing competition.

The number of the people who joined in the journey down the Mekong River _____ four.

are found on all kinds of trees,butthey differ greatly_____ size and shape.

Under no circumstances _______the search far the missing plane.

When a storm is just ________,we must fix up the roof to prevent it from________.[ ]