The boy was in the water and his canoe was_______ away.
| A．running | B．floating. | C．flowing | D．pulling |
At last, we found ourselves in a pleasant ark with trees providing shade and _____
down to eat our picnic lunch.
| A．sitting | B．having sat | C．to sit | D．sat |
_____ into use in April 2000, the hotline was meant for residents reporting water and
heating supply breakdowns.
| A．Put | B．Putting | C．Having put | D．Being put |
Look out! The ceiling _____ fall down.
| A．is to | B．is going to | C．is about | D．will |
. -- Who are those people?
-- A group ____ itself peace protection.
| A．calling | B．calls | C．called | D．is called |
It was nearly supper time _____ Bob began to feel terrible in his stomach..
| A．that | B．when | C．since | D．until |