单项选择题

Non-gaseous substances which（）naturally as pure elements，such as gold，are rare and are often highly valued.

A.happen
B.perceive
C.occur
D.assume

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单项选择题

I simply couldn’t（）his intention.

A.figure out
B.bear out
C.get out
D.bring out

单项选择题

In Beowulf，（）fought against the monster Grendel and a fire-breathing dragon．

A.the Anglo-Saxons
B.Beowulf
C.the Scandinavian
D.the Winter Dragon