With real estate (房地产)______ in economy, a lot of rich farmland had to ______ new houses and offices in the county.
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.