(適語選択)
(1)If you (should / shall) happen to see him, please tell him to drop in.
(2)Even if the sun (were / is) to rise in the west, I wouldn't do what you’re asking.
(3)If it (does / were) not for air, nothing could live here.
(4)(Have / Had) it not been for your help, I would have failed.
(5)If I (had / have) bought the dictionary then, I could check it now.
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