He was so ______ thought that he didn’t see the pole on the road.
| A．buried in |
| B．careful with |
| C．busy with |
| D．serious about |
"How many elephants did you see?" "_____".
| A．None | B．No one | C．Not many ones | D．No many |
I remember _____ word he said that day.
| A．all | B．both | C．each | D．every |
One of the students hasn’t prepared _____ lessons very well.
| A．one’s | B．ones | C．their | D．his |
. His attitude to us is _____ of a comrade.
| A．one | B．it | C．that | D．those |
. He was ill. _____ is why he didn’t attend the meeting.
| A．This | B．It | C．There | D．That |