Another driver had just driven into the back of Jack's car ______ he was waiting at some traffic lights.
| A．since | B．once | C．while | D．during |
Nothing except some chairs _____ there.
| A．was | B．were | C．has | D．had |
Many sheep _______ eating grass by the river.
| A．is | B．are | C．is being | D．have |
At the bus stop _______ a solider and two young people on their way to the village.
| A．were | B．was | C．is | D．sits |
Such _________ the difficulties that we are now faced with.
| A．are | B．is | C．is being | D．be |
The Chinese _____ brave and hardworking.
| A．is | B．are | C．be | D．being |