—What __________ when I phoned you?
—I __________ my homework. I began to bathe.
| A．had you done ；finished |
| B．were you doing；had just finished |
| C．did you do ； had just finished |
| D．were you doing ； was finishing |
Leaves are found on all kinds of trees, but they differ greatly ________ size and shape.
| A．on | B．from | C．by | D．in |
I have offered to point the house _____a week’s accommodation.
| A．in exchange for | B．with regard to |
| C．by means of | D．in place of |
Everything was perfect for the picnic ______ the weather.
| A．in place of | B．as well as | C．except for | D．in case of |
Don’t promise anything ______ you are one hundred percent sure.
| A．whether | B．after | C．how | D．unless |
We’ll have a picnic in the park this Sunday _________ it rains or it’s very cold.
| A．since | B．if | C．unless | D．until |