He promised _____ back in a few minutes.
--Have you ever seen Peter recently? --Yes. He__________ me to ask you how you___________ along with your new job these days.
I lost my way in complete darkness and, _____matters worse, it began to rain.
_________she couldn't understand was_______fewer and fewer students showed interest in her lessons.
The queen will visit the town in May, _____she will open the new hospital.
Lu Xun was ___________ medical student before he turned ___________ great writer.