Complete the sentences.

to (2), in (2), at (3), by

1) This picture is ... Valentin Serov, my favourite painter.
2) Do you often go ... the theatre? 3) My good friend and I are interested ... painting. 4) His sister is very good ... drawing. 5) They say there’s a new ballet ... this opera house.
6) There’s a good collection of puppets ... this museum.
7) The boy made his new picture ... pencil. 8) How important ... you is your hobby?