With the beginning of __ and ______, the national conventions have become media events.
The spare stocks of extra components have to be stored when __ is used.
I apologize to you on behalf of my store for ______ (几天前你在我们店里受到的冷遇).
What was used to carry most mail after the colonies became a nation?
Nowadays, people are busy with their jobs and ________(很少有人愿意花时间做饭).
They needed to invest in __ if the owners of all-electric cars wanted to reduce time to charge.