—Look at these tracks. It __________ be a wolf.—It needn't be. It ___________ be a fox.
. The manager believed price will not rise by more than four percent.
After the long journey, the three of them went back home, .
--- What about talking with others while learning spoken English? --- In my opinion , .
--- It seems that the manager is very unhappy. --- Surely she is. You see, Steve left the company half an hour ago, with his work_______.
When we sleep is cultural as biological-and practices differ greatly round the globe.