China ________ a sharp increase in the number of aged people over the past decade.
| A．sees | B．saw | C．has seen | D．will see |
Jr. Parkinson stood up and left the room, ____ the door behind him.
| A．closing | B．closed | C．close | D．to close |
—You didn’t tell me the truth about this matter, Barbara.
—Are you ____ me of lying?
| A．charging | B．catching | C．criticizing | D．accusing |
Most of the roads were covered with thick snow, ____ made our journey more difficult.
| A．one | B．it | C．which | D．that |
— You look tired.
— Yes. I ___ non-stop until 8 o’clock.
| A．had worked | B．work | C．have worked | D．was working |
People are living in ___ world where mouse clicks rule our life, so online searches have become _____ must.
| A．the; / | B．/; a | C．a; a | D．a; the |