___ the morning of June 25, they visited the factory.
In B. On C. At D. From
–We will visit the Summer Palace ______ there is a heavy rain tomorrow.
--OK! Boating on the lake must be great fun.
| A．if | B．as soon as |
| C．unless | D．since |
–How long ______ the restaurant ______? --For eight years.
| A．has; opened | B．has; been opened |
| C．did; open | D．has; been open |
–What should I do ______ healthy, doctor? --You should take more exercise.
| A．keep | B．to keep |
| C．keeping | D．keeps |
–Have all the boys known that they ______ an English test this afternoon?
--Yes. Every boy has been told about it.
| A．had | B．has |
| C．are having | D．will have |
He offered ______ valuable advice that ______ people disagreed.
| A．such; a few | B．such; few |
| C．so; a few | D．so; few |