---Were you satisfied with the exam result? ---Not a ______. I should have done much ______.
___ there are living creatures in the outer space as those on Earth hasn’t been proved until now.
With so many orphans _______, the charity organization calls for more donations.
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.