habit is formed, it will take a long time to get rid of it

．______ the satellite launch drawing near, the research workers put their hearts to the test and always stayed up late

Chinese Chang’e-2, the US sentup a space probe to hit the moon to see ______.

___________do you clean the goldfish’s tank–Three times a week.

Beijing is not the first city in China to fine eaters on the subway.—Yes. People ______ eat on the subway in Hong Kong are punished up to 2,000 Hong Kong dollars.