_______________you practice every day，you won' t make any progress.（ ）
| A． |
Although |
B． |
Unless |
C． |
If |
D． |
Since |
Frank will fall behind in studies he works hard from now on．（ ）
A．unlessB．becauseC．if
Could you tell me by Wechat？（ ）
A．what can we doB．what we can do
C．what do we do
David， make trouble at school． （ ）
A．can'tB．don'tC．doesn't
Tony， come on， we'll miss the World Cup．（ ）
A．soB．andC．or
Must we finish the homework now？
Our teacher doesn't ask us to． （ ）
A．Yes， we mustB．No， we mustn't
C．No， we needn't