Pieces of bamboo or wood ________ books between 2nd and 5th century AD.A. used to formed B. used to formC. were used to form D. used to beforming
I failed in the final examination last term and only then _______ the importance of studies.
Only by practising a few hours every day _______ be able to master the language.
_______ the people have become masters of their country _______ science can really serve the people.
—I would never come to this restaurant again.The food is terrible! —_______.
The old couple have married for 40 years and never once _______ with each other.