A team of explorers ___________ the ocean floor. (1 point)
were studying
are studying
have been studying
has been studying

Question

A team of explorers ___________ the ocean floor. (1 point)
were studying
are studying
have been studying
has been studying

frizz · Answer

It is in the present tense. So I would say, are studying.

teddyiswatshecallsme · Answer

Okay!

teddyiswatshecallsme · Answer

Both light and heat _________ causes of the sofa's fading color. (1 point)
was
were
is
is

frizz · Answer

Are there two is's?

frizz · Answer

Or is one supposed to be are?

frizz · Answer

Because, I would say: Both light and heat are causes of the sofa's fading color.

teddyiswatshecallsme · Answer

No its Is and isn't.

frizz · Answer

Then I would have to say it is in a past tense, meaning it would be were.

teddyiswatshecallsme · Answer

Physics ______ a very interesting subject to study. (1 point)
is
are
were
aren't

frizz · Answer

Saying it out loud, is sounds grammatically correct.