①應(yīng)當(dāng)行使期權(quán); ②不應(yīng)當(dāng)行使期權(quán); ③不應(yīng)當(dāng)行使期權(quán); ④應(yīng)當(dāng)行使期權(quán); ⑤應(yīng)當(dāng)行使期權(quán)。