New functions ____to the phones at present by scientists.[ ]

Studies show that people are more _______ to suffer from back problems if they always sit before computer screens for a long time.

Many people say they love birds, but some plant trees _________ some make cages

This is _______ armchair. I’m writing with________armchair.

You promised to ____________ the goods to our place immediately,but we haven’t seen any of them yet.