___ nearly all behavior is learned behavior is a basic assumption of social scientists.
If something such as a product, an activity, or someone’s career______, it suddenly becomes very successful.
—Your suitcase seems very heavy. Need any help?—__________.
A common memory they all have ______ their school days is the school uniform.
Every 40 minutes we will take a 20-minute break, ______ your guide will give a short talk on different aspect of the Great Wall.
Languages across the world are becoming extinct ______ endangered mammals and four times endangered birds.