Mr. Hall understands that _______ math has always been easy for him, it is not easy for the students.
One of the first foreign expeditions _______ Mount Qomolangma arrived in Tibet in 1921.
________ at the city centre, the old temple has a history of more than 500 years.
If the weather had been better, we could have gone outing. But it ____ all day.
________ a difficult situation, so you should send him a message and give him some advice.
They sold ______ boxes of such sweets last week.