—________I’m very busy now. Could I call you back after work? — OK. I’ll wait for you.
—Would you mind closing the window to keep out the noise? —________.I’ll do it right away.
There are about ______ people in the park on National Day.
We found ______ very difficult for the children to understand what the chairman said at the meeting.
.________ useful book is helpful to ________ artist.
Sometimes the best and most beautiful things in this world ________.but can be felt with the heart.