.—Have you seen___________pen? I left it here this morning.—Is it___________black one? I think I saw it somewhere.
The ticket __________ two people to the party.
In spite of repeated wrongs done to him, he looks __________ to people greeting him.
I'd appreciate __________ if you would like to teach me how to use blog and twitter on the Internet.
He prefers __________ the fruit at half price rather than __________ them to go bad.
__________ is very important for us students to learn English well.