We found ______ very difficult for the children to understand what the chairman said at the meeting.
| A．that | B．its | C．this | D．it |
We still remember once _________ round the famous tower when we were young.
| A．having taken | B．to be taken |
| C．having been taken | D．to have taken |
----Marx looks nervous.
----So __________ you if you had so fierce a competition.
| A．do | B．did | C．will | D．would |
_________ caused the accident is still a mystery.
| A．How | B．What | C．That | D．Where |
The sun began to rise in the sky, ________ the mountain in golden light.
| A．bathed | B．bathing | C．to bathe | D．have bathed |
I wonder whether the teacher is one of those who _______ to the mountain village to help the children there.
| A．have sent | B．has sent | C．has been sent | D．have been sent |