The latest edition of Harry Porter has been a best-seller for 3 weeks_______.
Evidence has been found through years of study ________ children’s early sleeping problems are likely to continue when they grow up.
At our factory there are a few machines similar to _______ described in this magazine.
The traffic on the main streets has a longer green signal than _______ on the small ones.
—Shall we go for a drink at one o’clock this afternoon? —_______. Will two o’clock be OK?
Because of the financial crisis, days are gone ________ local 5-star hotels charged 6000 yuan.