_______ visitors come to China every year .[ ]

I think _______ our duty to keep our environment clean and tidy.

The boy was so ______ in reading that he didn’t hear his father knocking at the door.

As far as I know, this man ____ risk anything than lose the ring for his wife.

Here are two rice cards. Which one belongs to ______?—Look. Here is my name. It must be ____. The other one is yours.