Sound travels ______ air ______ a speed of about 340 metres per second.
--- __________ bad weather! We can’t go on a picnic.--- What about reading some interesting books at home.
Don't throw that away --- it might come in handy.
The accident took place ten days ago.
After a hard day’s work, it is nice to get home and put your feet up.
No matter what Mrs Rich buys, the price is always her first thought.