Be careful!Don't walk on the grass，________ it will"cry"．（ ）
A．andB．butC．orD．so
Lao She is _____ great writer． He's especially famous for ______ play Teahouse．（ ）
| A． |
an； the |
B． |
a； the |
C． |
an；a |
D． |
a； an |
In May， President Xi Jinping spoke highly of the great changes of the Fenhe River in Taiyuan． I wonder ________．
Everyone should play a part in making it cleaner and cleaner． （ ）
| A． |
which places he visited |
| B． |
how we can protect the river |
| C． |
why such changes have taken place |
I am a little nervous every time I take exams．
Don't worry． Just try your best． ________， grades are not everything．（ ）
| A． |
After all |
B． |
As a result |
C． |
In the same way |
Friends often help us， especially during the hard time． So we should ________ them for their support． （ ）
| A． |
be sorry for |
B． |
be thankful to |
C． |
be interested in |
This year marks Earth Day's 50th birthday． It was created to remind people to ________ the earth﹣the home to all the living things．（ ）
| A． |
talk about |
B． |
care about |
C． |
hear about |