_____ some mammals came to live in the sea is not known[ ]

Shall we go for a picnic tomorrow—Well, it all _______ the weather.

I think maths isplaying a more important part in the new test system What aboutyou — ______ We should be more devoted to it

She _________ ten years ago.— You mean she _________ him for ten years

,you play so well But I ______ you played the piano