Doctor Smith has made another wonderful discovery, _______ great importance.
| A．which I think is of | B．which I think it is of |
| C．which is I think | D．I think which is |
_______ number of people invited was fifty, but _______ number of them were not happy to attend the meeting.
| A．A; a | B．The; \ |
| C．The; a | D．A; \ |
_________________, she can help her mother do lots of housework.
| A．As my sister is a child |
| B．Child as is my sister |
| C．A child as my sister is |
| D．Child as my sister is |
Along the Three Gorges, there are some small towns, _________ the climate is mild and the soil is fertile.
| A．where | B．which | C．that | D．whose |
Nearly 100 experts attended the meeting, most of them________ China.
| A．came from | B．come from |
| C．coming from | D．had come from |
To everyone’s surprise, Tom claimed _______ all his work two days ago.
| A．to finish | B．to have finished |
| C．finishing | D．having finished |