tern culture,21 was the age________ young people traditionallyreceived a key to their parents’ door, as a symbol of entering adulthood.

During the scientific experiment, Mr. Chen carefully poured the water into the tube, with my classmates _______ beside to see what would happen.

They are going to the library ________ the afternoon ________January 22nd.

My son seldom hasbreakfast.一It isunhealthy lifestyle. You must ask him to change it.

When you’ve finished with that book, don’t forget to put it back on the shelf, _______? [ ]