Some people do not have enough to eat while some others throw away food just__________ its poor taste.
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.
What is your daughter doing now? She is on the phone, ________with one of her schoolmates.