He ___ on the grass, looking at the clouds in the sky.

   A. is laying    B.is lying    C.has laid    D.has lied

—Hi，Joan.Any idea where Tom is?

—He ________ on the playground.I saw him there playing football just now.

A．shall be?? ????????????? B．should have been

C．must be?? ????????????? D．might have been

 He is a foreigner. But now he       on the right of the road in China.

A. used to drive      B. is used to drive     C. used to driving     D. is used to driving

When I came into the teacher’s office, he ________ on the phone.

He______on the farm for twenty years and now he is a teacher.

A．has worked        B．had worked        C．worked           D．works