I think maths ____ very interesting.
Great changes have take place in that school. It is no longer ______ it was twenty years ago, _______ it was so poorly equipped.
It is ______ that the US president will visit our country next month.
--- Do you mind if I open the window? --- ________ I feel a bit cold.
The brain ___________ grey and white matter, _______ weighs just over a kilo.
What____ you _____this time tomorrow?