3 . 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

4 . ___________ 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

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

A．so

B．but

C．or

D．for

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

A．if

B．as long as

C．unless

D．in case

7 . 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

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

A．Although

B．Or

C．So

D．But

9 . My parents won’t let me go out alone ________ they are sure I’m safe.

A．since

B．if

C．unless

D．because