. The child walked quietly to the bird. _______ into the forest when he was about to catch it.
Welcome to the Science Museum, everyone! This stone axe _______ in South Africa and experts can’t be exactly sure about its use.
Some biologists believe this is an ancient survival strategy, _______ a diet with 30 percent fewer calories than usual increased life span.
. The county, ________ in the north of Shanxi, has a history of more than 1,400 years.
—Shall we attend the concert this evening?—Great idea, _______ we can do some shopping first.
—Why do English people talk so often about the weather when they start a conversation?—Well, it’s probably because the weather is a(n)________ topic.