1 . The hikers made up their mind to reach the peak, ________ the weather was unfavorable, as they believed the view was breathtaking on the top.

A．as if

B．in case

C．even if

D．so that

2 . A recent study shows that the post-00s generation has an average bedtime of 00:33 a. m. __________ the pre-1970s has an average bedtime of 23:02p. m.

A．when

B．as

C．while

D．since

4 . Born in a wealthy family, the boy took everything in his life for granted___________ for the first time he saw how poor farmers struggled to survive the hard life with frugality.

A．until

B．that

C．when

D．while

5 . ___________ the recently released artificial intelligence video product Sora has gained significant attention for its cutting-edge technology and innovative features, concerns about its potential ethical implications, such as privacy violations, have emerged, posing a challenge for developers and policy makers.

A．Since

B．Once

C．When

D．While

6 . Mike hasn’t appeared for two weeks, __________ his friends are wondering what has happened to him.

A．so

B．but

C．or

D．for

7 . He will never make progress in math __________ he really wants to learn it.

A．if

B．as long as

C．unless

D．in case

8 . Bravery doesn’t mean doing something you are good at but only means you insist on doing it ______you feel scared.

A．now that

B．as if

C．even though

D．in case

9 . ________ he is a ten-year-old boy, he can take good care of himself.

A．Although

B．Or

C．So

D．But

10 . It is 10 years ________ these important environmental problems were addressed, which benefited the entire world.

A．since

B．after

C．before

D．when