you smile at others， they will smile back．（ ）
| A． |
If |
B． |
So |
C． |
Or |
D． |
Though |
﹣﹣﹣Why does our chemistry teacher often ______ her？
﹣﹣﹣Because she gets full marks in chemistry every time.（ ）
| A． |
praise |
B． |
forget |
C． |
control |
D． |
hurt |
﹣﹣ How do you improve your English______ ？
﹣﹣﹣I often talk with the persons whose mother language is English.（ ）
| A． |
population |
B． |
transportation |
| C． |
pronunciation |
D． |
suggestion |
﹣﹣﹣Would you please________ what you said？
﹣﹣﹣Sure.I asked you to have a rest.It's too hot today.（ ）
| A． |
show |
B． |
spell |
C． |
review |
D． |
repeat |
﹣﹣﹣When will you go to see your grandpa？
﹣﹣﹣I'll see him_______ I get off the plane.You know I miss him very much.（ ）
| A． |
as soon as |
B． |
as long as |
| C． |
as far as |
D． |
as easily as |
China is making _______ to help more developing countries fight against COVID﹣19.（ ）
| A． |
a decision |
B． |
a mess |
C． |
an effort |
D． |
a mistake |