21.This book is said to be a special one, which____many events not found on other history books.
--- The task is challenging and demanding. Who do you think can make it? --- _______ my partner have a try? I think she is the right person to do it.
Each day is a gift, and ______ my eyes open, I’ll focus on the new day and all the happy memories I’ve stored away.
Someone says that love is a rose with thorns(刺). It is attractive from a ______, but as soon as you touch it, you might get hurt.
It is required that under no circumstances ______ betray ourselves even if there are temptations like money or beauty.
When he woke up the next morning, he discovered that the boat had, ______, travelled to Calais.