He made another wonderful discovery, ______ of great importance to science.
| A．which I think is | B．which I think it is |
| C．which I think it | D．I think is |
Some people eat with their eyes.They prefer to order what ________ nice.
| A．looks | B．smells | C．feels | D．tastes |
It was already past midnight and only three young men ________ in the tea house.
| A．left | B．remained | C．delayed | D．deserted |
On hearing the news of the accident in the coal mine，she ________ pale.
| A．got | B．changed | C．went | D．appeared |
The effect of the medicine on this kind of disease remains ________.
| A．seen | B．to be seen | C．seeing | D．to see |
The card reads：“Dear Mom and Dad，they are ________ everyone write home.Love，Joey.”
| A．advising | B．suggesting |
| C．letting | D．making |