We all know that one of the world's most popular sports football．（ ）
| A． |
am |
B． |
is |
C． |
are |
Now teenagers __________to do voluntary work for their local commodities.
A．are encouragedB．were encouraged
C．have encouragedD．are encouraging
During our holidays，we should avoid _________up at night and oversleeping in the morning.
A．stayB．to stayC．stayedD．staying
The documentary A Plastic Ocean is so impressive that I ___________it several times so far.
A．watchedB．watch
C．have watchedD．will watch
The gravity on Mars is only about there eighths of ___________on the Earth.
A．thatB．thoseC．oneD．ones
Peter has ________ memory and often forgets the names of people round him.
A．longB．goodC．richD．poor