社会发展得太快，谁会站在下一个技术领域的潮头，没人会知道。
The society is developing so fast that nobody knows who __________________________ in technology next.
这枚邮票价值可观，值得收藏。
The stamp is of __________________________________________________ collecting.
火神山医院在武汉建成之后，在与新冠肺炎的战斗中起到了重要的作用。
Huoshenshan Hospital ________________________________the Novel coronavirus pneumonia after it was set up in Wuhan.
我很高兴顺利地接通了他的电话。
I’m glad to_______________________________________________________
无论你对什么不满意，请务必告之我们。
__________________________________________________, be sure to let us know.
做饭前你应该洗手，以防感染传染病。
You should wash your hands before preparing food to ___________________________spreading infection.
