--- I was walking along the street and all of a sudden, a car cut in and knocked me down．--- You can never be ______ in the street．

These natural parks are very important for preserving many animals, which would _______ run the risk of becoming extinct.

Jane is          high school student in the United States.

 This kind of exercise is most _______, and therefore is a good test of your students’ ability.

 In that school, English is compulsory for all students, but French and Russian are ______.