_______(4)




A.thoughtful
B.thought
C.thoughtfully
D.thoughtless

Jet lag ____________ .




A.makes our body clock operate badly
B.causes our body clock to change
C.extends the hours of our body clock
D.upsets our body’s rhythms

The word "obtain" is closest in meaning to _________.




A.digest
B.carry
C.save
D.get

According to the passage, why is light coloring an advantage to large desert animals?




A.It helps them hide from predators.
B.It does not absorb sunlight as much as dark colors.
C.It helps them see their young at night
D.It keeps them cool at night.

They are known that colds can be avoided by eating the right kind of food and taking exercise regularly.




A.They are known
B.be avoided by
C.right
D.regularly

” I locked myself out of my apartment. I didn’t know what to do”
-“ You _____ your roommate”




A.need have called
B.could have called
C.would have called
D.must have called

Mark is nearsighted. He __________ glasses ever since he was ten years old




A.should have worn
B.must wear
C.need wear
D.has had to we

__________ migrate long distances is well documented.




A.That it is birds
B.That birds
C.Birds that
D.It is that birds

________(4)




A.who
B.whom
C.whose
D.which

_______(9)




A.successfully
B.successful
C.success
D.susceed