He started to learn English in 1990 and in the years ________ he kept on using it in his work.
The athlete fell off his bike when he _____ down the hill.
You can’t be ______ when you camp _____ an high altitude, where the air is thin.
I’d prefer ______ in the office rather than _____ at home watching TV.
She wishes to become a beautiful girl, _____ everybody loves.
Sometimes customers can’t help _____ the things they don’t really need.