Old people need special care in winter, as they are very______ to sudden change of the weather.
If you don’t wait _______ the red light, you will be punished by the policeman.
There was ____time ______I hated to go to school .
---- There is a lot of smoke coming out of the teaching-building there. ---- Really? It _____ be a fire, most probably.
This _________ girl is Mary’s first cousin, who is very lovely.
______, the concert began.