Football fans are often called the "12th man" because of their influence ______a team.

A．toB．fromC．onD．at

According to the new traffic rules，people ___________ wear a helmet when riding an e﹣bike.

A．mightB．mayC．canD．must

I know how busy you are and naturally I wouldn't take ________ too much of your time.

A．offB．upC．onD．down

Peter has ________ memory and often forgets the names of people round him.

A．longB．goodC．richD．poor

The gravity on Mars is only about there eighths of ___________on the Earth.

A．thatB．thoseC．oneD．ones