The students were ________ over the ________ problem，listening to the teacher with a ________ expression on their faces.
| A．puzzled；puzzling；puzzling | B．puzzled；puzzling；puzzled |
| C．puzzling；puzzling；puzzled | D．puzzling；puzzled；puzzling |
What the sick child needs most now ______ love.
| A．is | B．are | C．was | D．were |
Many people _________ lose one of their senses have made great achievements.
| A．who | B．whom | C．which | D．what |
—Do you mind my taking the books away ?
—________.
| A．Certainly , please do . | B．No , go ahead. |
| C．Yes , not at all . | D．No, please don’t. |
The reason for his success is ______ he worked very hard.
| A．why | B．that | C．whether | D．how |
He couldn’t ______ the fact that the money was found in his house.
| A．answer for | B．leave for |
| C．account for | D．care for |