Question

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David used to be a heavy smoker.Now he 's given un smoking .(保持句意不变）
David _____ ____ smoking now.
Kitty will believe it when she has seen it with her own eyes.(同上）
Kitty ____ believe it ____ she has seen it with her own eyes.
If he doesn't keep quiet ,he will have to leave the reading room.(同上）
____ he ___ quiet ,he 'll have to leave the reading room.

Answer 1

has stopped
won't until
Unless is

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Answer 2

has stopped

won't, until

Unless, keeps

Answer 3

David gives up smoking now.

Kitty would believe it that she has senn it with her own eyes.

Unless he keeps quiet, he'll have to leave the reading room.