He had to pause from time to time to wipe the sweat from his forehead, because the air-conditioning system ______________.

The government has __________ a committee to examine the fishing industry.[ ]

I followed your advice on how to appreciate Great Expectations, but I still can’t find an effective way to get clear its plot. Why— Well, ______.

In those days ,books could only be produced one at a time _____________.

We ________ the bridge for over two years and it will be half a year before it’s completed.