He is a good cook at home and takes good care of the children, and _____his wife.

-- I didn’t go to Mary’s party last night because my car broke down. ---You could have borrowed mine. I ____ it.

There is no doubt ________ Tom is a good clever boy.

Some people are worrying about the possibility ________ mobile phones could be responsible for a range of illnesses, from rashes(皮疹) to brain tumors．

His dog did everything he told it to do. ___ a most obedient animal.