— 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.

As a rule, the buyer is responsible for        a ship or booking the shipping space.

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

— Hey, Derek, which do you think is harder to learn, marketing or designing?

—                       

      people are no longer worried about whether their food is safe or not      they enjoy a better life.

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

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

—                      .

Actually, buyers are the group of people          want to buy certain goods or services.

Prices may change quickly if supply or demand         .

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

—                      

由能量自动分配及输送子系统和能量自动转换系统所组成的系统称为（    ）。