221. There are 5 ________ in the passage about nanometer(纳米) technology we have just read. Please tell me the general meaning of the first one.
—I’ve got an “A” in the examination. —That’s a good ______. You will surely win a second.
In order to learn the _______ of the family business, Bill took a job as messenger boy in one of the offices.
Electricity, like other forms of ______, has greatly increased in price in recent years.
—Hello, I’d like to speak to Henry. —Oh, which _______? There are two ______ in our office.
Jim was late for two classes this morning. He said that he forgot both of the ______.