【单选题】
One can’t learn a language well, ________ he works hard.
【单选题】
I _______ asked ________ the question.
【单选题】
Let’s begin our class _________ you are all here.
【单选题】
Tom can’t come _____ he is ill.
【单选题】
We have cleaned our yard, _____ they haven’t cleaned theirs.
【单选题】
_______ he has said is not true.
【单选题】
They did it by _________.
【单选题】
My sister likes white ___________ I like red.
【单选题】
Work hard, _________ you will fail in the exam.
【单选题】
He was absent today ____________ he was hit by a car.