—Excuse me, sir. Would you do me a favor?—Of course. What is it?—I ________ if you could tell me how to fill out this form.
Paper is __________ great Chinese contribution to human civilization.
Read this story,__________ you will realize that not everything can be bought with money.
It was __________ that we wanted to stay here for another two days.
The suspect's fingerprints on the gun were the main __________ against him.
When they had finished playing, the children were made to __________ all the toys they had taken out.