Use past perfect continuous tp complete the sentences. See Reference Grammar1. Her eyes were red. It was clear she (cry). 2. Mrs Thompson(wait) for 3 quarters of an hour before the secretary came. 3. Janewas very tired. She (do) her room since afternoon. 4. Alec said he(stand) there since 6 o'clock. 5. Jill (study) English for 5 years beforeshe visited the USA.​