单词拼写
R are used to store water in case of floods or droughts.
Our school has a large hotel which a 1,000 guests.
Burning coal has led to g warming.
Water will change into ice when the temperature drops to the f point.
He is seriously ill. So he can’t take the t examinations.
The DCIO (坠毁) shortly after takeoff.
A bridge is a (建筑物) built over a river or road that allows people or vehicles to cross from one side to the other.
It is difficult to travel through the city on a (有雾的) day.
He is studying (土木工程) at university.
The submarine (浸入水中) to avoid enemy ships.
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