Mary got up late this morning, she didn’t catch the first bus．
A． because B． so C． for
—My aunt said she called you yesterday morning, but there was no answer.
—Oh, we were at home. Maybe my husband with memy car in the garden.
| A．were washing | B．had washed |
| C．was washing | D．Washed |
—Don't forget to come to our school assembly(集会)tomorrow morning.
—I won't. Ijust now.
| A．reminded | B．was reminded |
| C．reported | D．was reported |
silk feels soft and cool, it's difficult to be taken good care of.
| A．Because | B．Though | C．Since | D．As |
—Is David coming by train?
—He should, but henot. He likes driving his car.
| A．can | B．need | C．must | D．May |
—The air pollution is terrible.
— It will be worse ________ we take action to protect the environment.
| A．if | B．unless | C．until | D．When |