The ____________that there is life on other planets has always encouraged scientists to explore the outer space．（ ）
A．invitationB．possibility
C．orderD．advice
Sally，there's a pen on the floor．Is it yours？
Oh…yes．It's_____．Thank you．（ ）
| A． |
mine |
B． |
yours |
C． |
hers |
To be______good dancer，you need to learn more．（ ）
| A． |
the |
B． |
a |
C． |
an |
Dear friends， do you know ？
By working together!（ ）
| A． |
when we can make the Chinese Dream come true |
| B． |
when can we make the Chinese Dream come true |
| C． |
how we can make the Chinese Dream come true |
| D． |
how can we make the Chinese Dream come true |
We'd better follow the seven﹣step hand﹣ washing method healthy．（ ）
| A． |
to keep |
B． |
keep |
C． |
keeping |
D． |
keeps |
You've done a good job， and I'm sure you can do it ．（ ）
| A． |
worse |
B． |
worst |
C． |
better |
D． |
best |