My mother... do much work at home, so I... do shopping.
a)has to, shall have to
b)have to, will have to
c)will have, have to
d) doesn't have, must
e)has to, don't have

Nobody... explain his absence and the police... find out anything about it.
a)could, wasn't able to
b)can, are not able
c)couldn't, could
d)could, weren't able to
e)was able, had to