．— I wonder if you _______ a picnic tomorrow.— Yes. But if it ______, we’ll visit the museum instead.

Last night Dad and Mum didn’t come back home ________ I finished my homework.

The students gave a quick answer to the question ________they did it,________was raised by the foreign visitors.

I’m glad to hear a new school building has been put up ______ once lay an abandoned cinema.

I’ll give the prize to _______ finishes the work first.