根据句意，用所给动词的适当形式填空。
小题1:We all know that smoking ( not allow) in public places.
小题2:Boys and girls, (put) all your effort into study and you will surely get good grades in the high school entrance examination.
小题3:Yancheng is well worth (visit) because it has many tourist attractions now.
小题4:We really hope a high-speed rail (build) between Yancheng and Shanghai in the near future?
小题5:Look, can you see those balloons (rise) up in the sky.
小题1:isn’t allowed
小题2:put
小题3:visiting
小题4:will be builded
小题5:rising
题目分析：
小题1:句意：我们都知道公共场所禁止吸烟。Smoking与allow是被动关系，因此要用被动语态。故答案为isn’t allowed。
小题2:句意：同学们，将你们的注意力集中在学习上并确保你可以在中考中取得好成绩。资本局是一个祈使句，因此用动词原形。故答案为put。
小题3:句意：盐城值得参观，因为现在那里有很多旅游景点。Be worth doing sth“值得做某事”，故答案为visiting。
小题4:句意：我真切希望不久的将来可以再盐城和上海之间建起高速公路。high-speed rail与build是被动关系，因此要用被动语态。时间状语是in the near future，因此时态是一般将来时。故答案为will be builded。
小题5:句意：你能看到那些正在天空中升起的气球吗？see sb doing sth“看见某人正在做某事”，故答案为rising。