1.Use past perfect continuous to complete the sentences. 1) Her eyes were red. It was clear she (cry). 2) Mrs Thompson(wait) for 3 quarters of an hour before the Secretary came. 3) Jane was tired. She(do) her room since afternoon. 4) Alec said he (stand) there since 6 o'clock. 5) Jill (study) English for five years before she visited the USA. 6) It was late at night when he realized that he (work) with computer for hours.