How long did it take them to get ___ this river?A.through B,over C.across D.till
During the last three decades, the number of people participating in physical fitness programs ___ sharply.
When the group discussion is nearing its end, make sure to ____it with important points.
Eye doctors recommend that a child’s first eye exam ____at the age of six months old.
______how others react to the book you have just read creates an added pleasure.
If we leave right away, ____we’ll arrive on time.