最好給爲什麼,還有怎樣區分to和for

題目：

最好給爲什麼,還有怎樣區分to和for
I waited over twenty minutes ( ）my food because there were so many people in the reseaurant.
A for B on C to D about

解答：

選for,wait for sth.表示等待某物,而wait for sb.to do 表示等待某人做某事,比如：he is waiting for me to go shopping with him.他等我和他一起購物.