Поместить глаголы в просто или непрерывно, чтобы завершить предложения. We (walk) around the haunted house when suddenly we (hear) a strange sound.
The pop singer (dance) on stage when she ...(fall) over.
They (study) at university when they (design) the new computer program.
The signer (warm) up while the audience (wait) to enter the stadium.