A survey of the opinions of experts that three hours of outdoor exercise a week good for our health．（ ）
| A． |
show； are |
B． |
shows； is |
C． |
show； is |
D． |
shows； are |
The earth is the planet _______ provides us with everything we need，fresh air，clean water and so on．It's our duty to protect it．（ ）
| A． |
who |
B． |
that |
C． |
where |
I am really proud of my group _______ we're always discussing and sharing study secrets together．How important the group work is!（ ）
| A． |
because |
B． |
though |
C． |
unless |
In our life，we need to _______ those people who help us，such as our parents，teachers and friends．（ ）
| A． |
thank |
B． |
remind |
C． |
teach |
Confucius （孔子） is also very famous in many Western countries because he taught people to be _______ to others first．（ ）
| A． |
similar |
B． |
kind |
C． |
important |
During the next few days，I decide to have a good _______ by taking a walk or seeing a movie．I really need to relax．（ ）
| A． |
meal |
B． |
sleep |
C． |
rest |