I have got a backache.— That’s not surprising. You ______ in front of thatcomputer too long.

The of the radios could not find a market for them, because the radios were badly designed.

We may find that learning a foreign language does not have to be ______learning our mother tongue, but can in fact be as easy.

____ from endless homework on weekends, the students now find their own activities, such as takinga ride together to watch the sunrise[ ]

She witnessed an accident ______ a minibus had a head-on crash with a taxi.