■ bow and arrow

“弓箭”如果理解为一种武器的整体，作为主语时动词用单数。

• The bow and arrow was invented at that time.弓箭是那个时候发明的。

• cease
• celebrate
• cement
• center
• centre
• ceremonial
• ceremonial 与 ceremonious
• ceremonious
• certain
• chancellor
• change
• change
• change
• change 与 alter
• chemistry
• childish
• childish 与 childlike
• childlike
• choose
• chord
• chore
• church
• cinema
• circumstances
• civic