Ebola threatens many people's lives in West Africa. It is said __________ the most dangerous virus on the planet. (A) that (B) to be (C) being (D) to being
(B) to be
A tiny chunk of the matter in the dead star ______ as ______ a mountain.
(A) weighs; much (B) is weighed; much (C) weighs; many (D) is weighed; many
(A) weighs; much
Only if the sky is clear _______ see the star sign at night. (A) one can (B) so can one (C) can one (D) so one can
(C) can one
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