Yesterday Tom was late for school theheavy rain.A．because

When ____about his family, he is alwaysrefusing to answer.

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

Simon has gone abroad to have ____________ European tour.— Oh, really It must be ____________ unusual trip for him.

We must set aside some money for a rainy day __________ run out of our income immediately.