When I passed the entrance examination, my family __ me __ my successes.
| A．celebrate; on | B．congratulated; on | C．celebrated; to | D．congratulated; to |
______ the workers’ working conditions, the boss will allow them to have a coffee break.
| A．Improving | B．To improve | C．Having improved | D．Improved |
My friend David was not used _______ by air, so he felt unwell(不舒服).
| A．to traveling | B．to travel | C．traveling | D．Travel |
We stopped on our way to London for _____.
| A．an or two hours | B．an and two hours | C．one hour or two | D．one or two hours |
____ that caused him to serve dinner an hour later than usual.
| A．It was we being late | B．It was our being late |
| C．It was we were too late | D．It was because we were late |
China ________ a sharp increase in the number of aged people over the past decade.
| A．sees | B．saw | C．has seen | D．will see |