The old man fell down the front steps, knocked his head, and lost ________; when he woke up, he was back in his house.
Those _____ cannot answer all three riddles will be condemned to death.
Some people get in touch with each other by mobile phones__________ others keep contact with each other by e-mail.
It’s much easier to make friends ____ you have similar interests.
I graduated from college twenty years ago and I ____________ as an English teacher in this middle school ever since.
The girl has a great interest in sport and ____ badminton classes twice a week over the last three years.