Dr. Bake is a professor of physics. ________，he is a famous writer.

Tom’s parents died when he was a child, so he was ______ by his relatives.

—How do you deal with their objections to our plan？—I think we can safely ____ them since our plan is made on a scientific basis.

-Tom has a lot of parties recently.- Yes, that may ________ why he didn’t do well in the test.

She can't help ______ the house because she's busy making a cake.