The young lady often makes meals ______ for herself for she is _____ about what she eats. 

– I’m sorry for what I said. -- Forget it, I can’t remember _________.

After taking part in several rounds of competition, the athlete         won first prize.

When asked why he prefers bikes to buses, the professor said,  “Riding a bicycle takes __________ half an hour, but it’s more convenient and environmentally friendly. ”

History is _______ a subject which only lets us know something in history..