___________lessons were not difficult.
This year many factories raised the prices of clothes to _____ the higher cost to customers.
Before the operation, the doctor had to talk to the patient in order to remove her fear________ she might die during the operation.
— How about dinner tonight? It's on me. — ______ .
She ______ someone, so I nodded to her and went away.
I'll be out for some time. ______ anything important happens, call me up immediately.