It is immediately obvious that water is to be _______ to the development of life.
Playing football and watching TV _____ both interesting.
---Is anything _____? ---I can’t decide which dress I should wear at my friend’s wedding party. ---I don’t think it ____.
Mr Smith, ________of the________speech, started to read a novel.
The pen I______I ________is on my desk, right under my nose.
The traveler didn’t know________which direction to go.