— Is it better to be physically attractive or intelligent?

   —                      . 

— Do you prefer a portable or a clumsy 3D printer?

—                      .

Sometimes buyers only purchase some        , tangible or intangible.

You can have eggs      or hard-boiled.

Goods are carried by several        of transport--on road or rail, by sea or air.

在教育史上，第一个把教育学建立在心理学和哲学的基础之上进行研究，从而被誉为“科学教育学的奠基人”的教育家是____________。

Every child is unique. Don’t        him or her to others.

— May I suggest the sales start on or about October 1?

—                      .

Prices may change quickly if supply or demand         .

— I wonder whether I could accept this discount or not.

—