The news shocked the public,to great concem about students' safety at school.
| A． | having led | B． | led |
| C． | leading | D． | to lead |
I_______ my homework at nine o'clock last Sunday morning.
| A．am doing | B．was doing | C．do | D．did |
The boss _________ company I worked in two years ago has _______ in solving such kind of problem.
| A．whose; many experiences | B．who; many experiences |
| C．whose; much experience | D．who; much experience |
She _______ live in North China. As a result, it is difficult for her to _______ the climate here.
| A．was used to; get used to | B．used to; get used to |
| C．used to; used to | D．was used to; use to |
Tom’s English is not good, so he devoted all his free time to __________ it.
| A．studying | B．study | C．studied | D．studies |
Who will be ___________ the company when the manager (经理) is out?
| A．in charge of | B．in the charge of |
| C．take charge of | D．take the charge of |