I can't see Lucy because she is _______ the tree．（ ）
| A． |
in front of |
| B． |
behind |
| C． |
next to |
﹣What is the ____ of your excellent spoken English？
﹣Practice makes perfect!（ ）
A．resultB．influenceC．dutyD．secret
﹣May I use your computer， Mr． Black？
﹣____．I will use my iPad instead．（ ）
A．Go aheadB．Thank you
C．Sorry， you can'tD．I'm afraid not
The Chinese government will always do ．（ ）
A．what has he promised to do
B．what has he promised do
C．what he has promised do
D．what he has promised to do
You must make sure your mask （口罩） is clean you put it on．（ ）
A．beforeB．afterC．sinceD．where
We believe that China will become one of in the world．（ ）
A．the strong countries
B．the strongest country
C．the strongest countries
D．the strong country