单选题 After years of research, the scientists made a major ______ in the fight against the disease, discovering a new way to treat it.

单选题 We didn't know that we weren't good enough ______ someone told us.

单选题 After a long and intense chess match, the younger player finally managed to ______ the defending champion.

单选题 The project was ____ a great success, thanks to the team’s joint efforts.

单选题 I see the cultural messaging everywhere that says that an ordinary life is a meaningless life. The first “that” in the sentence functions as ______.

单选题 As it turns out, the phrase “keeping up with the Joneses” derives from a cartoon strip of that name that launched in 1913 and ran for 26 years. What is the main structure of the main clause? (主句主干)

单选题 It’s ____ to prepare an emergency kit for natural disasters.

单选题 Instead of chasing material wealth, she chooses to ____ a simple and peaceful life.