7、ugh C.over D.across【例9】--WhenwillMr.BlackcometoBeijing?--____September5th.A.OnB.ToC.AtD.In【例10】____thenightbeforeChristmasDay,parentsfilltheirchildren’sstockingswithsmallpresents.A.OfB.AtC.ToD.On【例11】There are some birds singing___ the trees. A in B. o
8、n C. at D. from 【例12】There are so many apples___ that tree.A. in B, on C. at D. from 【例13】 The United States is ____ the south of Canada and ___ th