The Louvre is the most famous French museum where many priceless art works are ____ , including the Mona Lisa[ ]

下列分析别里科夫恋爱失败的原因，错误的是（）

look so upset, Jane． _____– I have been told my father has got skin cancer．

Life ____ be very hard for people living in the north of Canada as it is very cold there in the winter. —Yes, the weather there ____ be as low as 60°C below zero.

With the help of high technology, more and more new substances ______ in the past years