By nine o'clock, all the Olympic torchbearers had reached the top of Mount Qomolangma, _______appeared a rare rainbow soon.
The man put out the cigarette when _______ thatsmokingwasnotallowedonthetrain.
Cherry was afraid she wouldn’t fit in at her new school, ______ she made friends quickly.
With the rise of modern communication tools, handwritten letters ______ by emails.
---Have you seen Jane this week? ---No, but I ________ her call on my way to work this morning.
______ well, you need to have a good sense of balance.