The chief engineer of the high-speed railway ________ Shanghai to Beijing always devotes most of his time ________ his work.

She ________ a smile when she heard her family went to Italy without her.[ ]

Which one do you want to buy, anipod touch 4, an ipad 3 or an iphone 5 ?—______. They are too expensive.

She _____volleyball regularly for manyyears when she was young.

Once a decision has been made,all of us should____ it. [ ]