Experts believe ________ people can waste less food by shopping only when it is necessary.
Exactly ____they did when at last they reached the sea remains a complete mystery.
One thing’s for sure, the fire _____by some cigarette butts.
You could ________ this a really nice room if you bought a new carpet.
--- You’ve sold your car! You don’t need one? --- _____. The traffic is too heavy nowadays.
. --- I think the waiter has forgotten us. We ________ here for over half an hour! --- I think you’re right. He probably thinks we have already ordered.