【C5】A．neverB．yetC．alreadyD．since

【C19】A．all readyB．enoughC．alreadyD．always

A．yetB．stillC．alreadyD．too

【C5】A．untilB．onceC．afterD．since

A．onceB．neverC．alreadyD．ever

【C17】A．stillB．yetC．alreadyD．often

【C3】A．henceB．yetC．sinceD．that