______the house was started before she went to Africa and now it is still under construction.
| A．Working | B．Working at | C．Working on | D．Work on |
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 |
Today, we’ve discussed a number of large summer gatherings for feasts and celebrations _____the Inuit usually swap stories.
| A．where | B．when | C．which | D．why |