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.
He focused his effort ____the house ___sale for fear that the prices of them would go up suddenly.
Harry was so outgoing that he ___ the other children very well in kindergarten.
---- Could you turn the TV down a little bit? ---- _____. It is disturbing you.
Only after you have reached eighteen _______the army.
Look! __________.