In fact, students always ____ between study and hobbies.
夏天的清晨,草地或树木上露珠下面的叶脉看起来比较大,这是露珠产生____镜功能的结果,形成了____.(选填“实像”或“虚像”)
校园内铁制车棚易生锈,写出一种防止其生锈的方法:____;同样是金属,为什么金属铝露置在空气中不容易被腐蚀?____.
----Don't smoke here, Dad. Smoking _____ in public places.
----Oh, sorry. I'll stop right now.