---You may find the key to the maths problem on page 107. ---Ah, it’s so simple. I wonder why I ________ of that.
We want to rent a bus which can ______ 40 people for our trip to Beijing.
She will have to find some other work,for she can't ______ this loud noise any more.
—Alice looks blue today. —Yes,I asked her,but she wouldn't say ______ troubled her.
I'm afraid our supply of vegetables will soon ______.
As if he ______ my mind,he stood up and offered me his seat when I got on the crowded bus.