The biggest challenge we all face is to prevent further environmental disasters. We ________ take action before it is too late.
| A． |
can |
B． |
must |
C． |
may |
D． |
might |
-Daddy，can you come home for supper with us this weekend？
-________，but I might be a little late．
| A． |
I'm busy |
B． |
Hard to say |
| C． |
Of course |
D． |
never mind |
Help others in need，_____________ they will help you when you are in trouble．（ ）
| A． |
although |
B． |
but |
C． |
and |
D． |
or |
-It's quite an interesting party!
-_____________．Why don't you join us？（ ）
| A． |
So it is |
B． |
Congratulations |
| C． |
Hold on，please |
D． |
Good luck |
-Why do students love Mr．Brown？
-Because he is very _____________．He always explains problems over and over again．（ ）
| A． |
clever |
B． |
serious |
C． |
creative |
D． |
patient |
Lily has lots of _____________．She can learn much from them and use them to mail letters．（ ）
| A． |
stamps |
B． |
toys |
C． |
newspapers |
D． |
novels |