_________do your parents come to visit you in the US， Tom？
Once a year．（ ）
| A． |
How often |
B． |
How long |
C． |
How soon |
D． |
How far |
Diet drinks（低热量饮料）are not quite as ___________ as you think.It is reported that drinking too many of them might lead to illness.
| A． |
helpful |
B． |
healthy |
C． |
popular |
D． |
delicious |
More and more children are interested in blind boxes __________ they wonder what is inside.
| A． |
so |
B． |
because |
C． |
unless |
D． |
though |
-Judy，why is your dog barking（吠叫）at the mirror？
-Because it can't recognize（认出）________ in the mirror.
| A． |
me |
B． |
it |
C． |
you |
D． |
itself |
The sign 
means that we must slow down and drive______ near the school.
| A． |
quietly |
B． |
quickly |
C． |
carefully |
D． |
seriously |
-As the saying goes， "The longest journey starts with a single step."
-_____________.Let's take action right now.
| A． |
No way |
B． |
You are right |
| C． |
What a pity |
D． |
I don't think so |