———It was a green dinner. _______
———Thanks. But it really only took an hour.
| A．You must be tired. | B．I enjoyed it very much. |
| C．You must have spent all day cooking. | D．I have never had it before. |
------Have you known each other for long?
------ Not very, ________we started to work in the ABC Motor Company.
| A．before | B．since | C．when | D．after |
According to the rules, students ______ get grades not lower than 85% in any subject in order to get the scholarship.
| A．will | B．shall | C．may | D．would |
The young scientist has made such great achievements in his chosen field ______ nobody else can make.
| A．that | B．what | C．which | D．as |
We were told not to touch the equipment in the laboratory unless ________.
| A．allowed to do | B．allowing to do |
| C．allowed to | D．allowing to |
------Where did you first meet your boyfriend?
------It was in the department store ______ he worked.
| A．which | B．that | C．what | D．where |