10. We went through a period _____ communications were very difficult in the rural areas.
| A．which | B．whose | C．in which | D．with which |
After walking on the zigzag path to the mountain top for a few hours, the tourists gathered under trees ________ shade and ________ down to have a rest.
| A．provided; sit | B．providing; sitting |
| C．providing; sat | D．provided; sat |
The fireman told us the troubles they had ________ the fire ________.
| A．getting; controlled | B．got; controlled |
| C．got; controlled | D．getting; to control |
Please hand on the papers to those ________ at the back of the classroom.
| A．seating | B．sat |
| C．seated | D．sit |
As a considerate secretary, she never fails to know what ________ in her daily routine.
| A．to expect | B．expected |
| C．expects | D．to be expecting |
________ the earth to be flat, many feared that Columbus would fall off the edge of the earth.
| A．Having believed | B．Believing |
| C．Believed | D．To believe |