1. while
Don't eat while reading.
Some continue to work part time, while others do volunteer work.
In the past, the boys were taught to fend for themselves while still very young.
During the past several years, many Japanese have been either killed or injured while traveling overseas.
Do you know anyone who hums while they work?
While they were away on holiday, their neighbours looked after the dog.
By the way, did you have any spare time to go sightseeing while you were there?
I am wondering if you would like to go and see Kabuki with me while staying in Japan.
Tom's father comes home once in a while, but he never sticks around for long.
The nation's trade balance improved last year as exports were strong, while imports remained steady.
They found out truth while examining a pile of relevant documents.
Tom should definitely visit an art museum or two while he's in France.
Last night Mizuki, very drunk, fell into the water while walking along the lakeside.
Father kept in touch with us by mail and telephone while he was overseas.
The area was cordoned off while fire fighters tried to keep the blaze under control.
2. until
Wait until further notice.
Sometimes, if I look at a forest of trees, I get in a trance and don't even realize until minutes later.
The cones of the jack pine, for example, do not readily open to release their seeds until they have been subjected to great heat.
My car broke down this morning and won't be repaired until Friday.
The people in the next room stay up until all hours doing God knows what.
If you weren't exposed to a language until you were an adult, you are very, very unlikely to ever sound like a native speaker of that language.
We drove through village after village, until we got to our destination.
Until quite recently, people in developed countries didn't care much about the environment.
We were to be married in May but had to postpone the marriage until June.
Hold the button down until you hear the shutter make a clicking sound.
Until you admit that you were wrong, I'm not going to talk to you.
A lot of people who have up until now been spending money having a good time now need to be more careful with their money.
Until Manet painted this picture, his female nudes were limited to goddesses.
My friend recommended that I shouldn't buy an iPad yet, but to wait until I see what Apple's competitors come out with.
I met Tom before I graduated from high school, but didn't meet Mary until many years later.