What were you doing when she dropped in? —I for a while and_________ some reading

Must I do the math exercise step by step? — Of course You can never be _____ careful with that [ ]

The young couple

The teacher stressed again that the students should not ________ any important details while retelling thestory. [ ]

Da RunFa Supermarket is _______ on weekends. We can do some shopping there on weekdays.–Oh, no. It ________ ever since last Friday.