________ deep down in the earth，the dead forests rotted away and became coal.
| A．Burying | B．Buried | C．To bury | D．Having buried |
I won’t call you, ________ something unexpected happens.
| A．unless | B．whether | C．because | D．while |
The manager suggested an earlier date _______ the meeting.
| A．on | B．for | C．about | D．with |
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 |