thinking about the problem when anapple fell off the tree, _______ him right on the head.

was younger, I’d often go for _____ drive withsome friends, purely for _____ enjoyment of it

WalMart，the world’s largest retailer(零售商)，sells in three months ________ the numbertwo retailer Home Depot sells in a year.

Have you watched the film “Avatar” — Not yet But I thefilm is worth watching

The Whites have planned to visit _______ Great wall in China.