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

While we _________, we saw a UFO land on a street. 

       you may have, you should gather your courage to face the challenge.

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

It was in Yuexiu Park _____ they dated for the first time _____ the old couple told us their story.