Our business won't improve ____ we offer better service to our customers．（ ）
A．becauseB．unlessC．afterD．since
Hey，Kate，I called you at 6：30 yesterday evening，but you didn't answer．
Oh，sorry．I ______ at that time．（ ）
A．am doing the dishesB．do the dishes
C．was doing the dishes
You are driving too fast．Safety is the first．
Sorry．I'll drive ______．（ ）
A．more slowlyB．much slowly
C．most slowly
Hurry up，______ we'll miss the early bus．（ ）
A．butB．orC．and
What time do you usually get up on weekends？
I usually get up ___ 7：00 o'clock in the morning．（ ）
A．atB．inC．on
Excuse me．Is this ______ruler？
No．It's her ruler．______ is in the pencil box．（ ）
A．your，MyB．yours，MineC．your，Mine