He could see the tall chimneys of the factory________.
I don’t think the color of the curtains ______ the color of your room perfectly.
It was______ back home after the experiment.
______ I have made great progress in my spoken English, I can not express myself freely.
It is _____ he often fails in exams _____ makes his parents worried about him.
Waves of red light are about twice as long as _______ of blue light.