下列构造层次，不属于刚性防水屋面构造层次的是_____

下列各种基础，不属于柔性基础的是_____

Many boys enjoy _______ football, basketball or baseball

－ What does the sign over there read － “No person ________ smoke or carry a lighted cigarette, cigar or pipe in this area”

Which do you think is ________, health or wealth？

29．__________ when you are on the bus or bike．

Which do you think is _________________important, health or wealth?

Either he or I ______to the airport.

装运液化石油气的罐车，当罐车内温度达到_____时，应采取遮阳或罐外冷水降温措施。

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

Hurry up, or you ______ catch the train.

下列不属于电子商务基础平台的是________。