---I was riding along the street and all of a sudden, a car cut in and knocked me down. ---You can never be careful in the street.
The best times to visit Shangri-la are spring and autumn ___ the temperature is at its mildest.
You have to wear a helmet and a life jacket for protection, just ___ you fall into the water. A. in caseC. unless C. though D. as
Since we ____ for almost two weeks, I’ll need to buy a large backpack in advance to carry my supplies of food and water.
Below ____ an article about advertisements ____ by a student for her English project.
_____ an ad does not lie, it does not mean it is altogether innocent.