Don’t bother Tom, he is ______ with the experiment on water molecules in the lab.
| A．focused | B．fixed | C．occupied | D．concentrated |
Nowadays some parents regret not ______ more time with their kids when they were young.
| A．to spend | B．spending | C．spend | D．being spent |
Have you heard that he, as well as his parents, ______ visited the Summer Palace?
—Really? No ______ he didn’t attend the meeting.
| A．have; doubt | B． has; choice | C．have; reason | D．has; wonder |
Only ______ a human being.
| A．when is it hungry a lion will attack | B．when it is hungry a lion will attack |
| C．when it is hungry will a lion attack | D．when is it hungry will a lion attack |
Don’t ______ a person only because he has failed in an examination.
| A．look up | B．look down | C．look down on | D．look up to |