8. She ............ (see) a weird-looking man while she ......... (pass) by a new shopping centre.
9. While 1 ........... (have) a bath, my husband .......... (arrive) back home.
10. Birds ........ (sing) while we ....... (cycle) last weekend
11. They ....... (swim) in the ocean when a big shark ......... (appear) close to them.​