----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.
In our class there are 50 students,half ___________ wear glasses.
With a lot of homework _________last weekend, Tom didn’t go to the movies with his friends.
They use computers to keep the traffic _________ smoothly.
Sarah, hurry up. I’m afraid you won’t have time to ______ before the party.
To qualify yourself for this kind of new job, I recommend that you ______ some online courses.