小题1:The doorbell rang suddenly when/while/as Mum/mother)was cooking supper/dinner last night/yesterday evening.
小题2:I’ll call you as soon as I get/ receive your letter.
小题3:Mr. Wu often spends lots of time telling stories to us.
小题4:I’m looking forward to a holiday without (any) homework..
小题5:She would rather wait (for) another hour than wake up her mother.
/ She prefers(preferred) to wait for another hour rather than wake up her mother.
/ She prefers(preferred) waiting for another hour to waking up her mother.