______ birds use their feathers for flight, some of their feathers are for other purposes.
Once
If
Although
Because
Some villagers reported a huge snake, _______ over two metres long, was found dead in a nearby cave.
It’s standard practice for senior 3 students like us ________ only 3 day off during our National Day holiday.
The internet was flooded with a game called the Ice Bucket Challenge(冰桶挑战), ________ raise awareness for a disease called ALS.
The visiting minister expressed his satisfaction with the talks, ______ that he had enjoyed his stay here.
____ on ten years of observation and study, the story shows that everyone dreams every night, whether they realize it or not.