234. After the 1911 Revolution, China began to use the Gregorian calendar (solar calendar) and at the same we have also used the lunar calendar(阴历) in which a leap year (闰年)______ every four years.
I used to drink a lot of tea but these days I _________ coffee. A. preferB. preferred C. have preferred D. am preferring
–What should I do first? --The instructions _________ that you should mix flour with water carefully first.
Pleasant music is often played _________ classes to make students refreshed and relaxed for a while.
二、单项选择 Don’t worry too much about ________ mistakes. They’re ________ natural part of learning something.
—We’d better go downstairs right now for lunch. —__________ They serve food 24 hours a day.