. His sister left home in 1998, and_______since.
| A．had not been heard of | B．had not heard of |
| C．has not been heard of | D．has not heard of |
As a boy, it’s really_________ for me to go on the stage to dance for the first time.
| A．touching | B．outgoing |
| C．willing | D．challenging |
Can you lend me the book ______the other day?
| A．about which you talked | B．which you talked |
| C．about that you talked | D．that you talked |
I like this book _______has a photograph of the author.
| A．of whose back cover | B．which back cover |
| C．whose back cover | D．of which back cover |
People ________do exercise every day have a better chance of staying healthy than those ________don’t.
| A．who; / | B．/; who |
| C．who; who | D．/; / |
He is the person _______,I believe, has the ability to do this challenging job.
| A．who | B．whom |
| C．him | D．which |