■ forward

要注意 look forward to 的 to 是个地地道道的介词，后面要跟着名词或动名词，不能把 to 当做动词不定式的 to。

• I'm looking forward to reading (*to read) your answer.静候回音。

• object
• objet d'art
• obligation
• obligation 与 duty
• obscene
• occupy
• occur
• of
• of
• of a
• of all
• off
• offend
• offer
• office
• off of
• of itself
• of one's
• often
• oil
• old
• on
• on
• on a first-name basis
• once