1. —Now online ____ are getting as popular as those taken in classes at school.

—That's true. More and more people take online classes now.

A. stores                               B. courses 

C. games                                D. payments

2. The little boy sits ____ his mother and listens to his mother telling interesting stories.

A. below                                B. for 

C. beside                               D. along

3. The new flight from Dazhou to Kunming makes it more ____ for us to travel.

A. important                            B. difficult

C. convenient                           D. boring