_______is known to us all is that the 2016 Olympic Games will take place in Rio de Janeiro.
| A．What | B．which | C．As | D．It |
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 |
No matter how frequently ________， the works of Beethoven still attract people all over the world.
| A．performed | B．performing |
| C．to be performed | D．being performed |