Our teacher taught us that water ___ at zero degree centigtade

Not getting that job was a big let-down.——Don’t worry. Something better will ____.

If the firefighters _____ in time, the fire would have resulted in many deaths in the hotel. [ ]

We were told not to touch the equipment in thelaboratory unless ________.

the man on the bike with a boy atthe front and the other at the back, the policeman signed _______stop