At three o＇clock this morning, I seemed ______ someone scream in the street.

The Bent Pyramid outside Cairo _____ ancient Egypt’s first attempt（过去的动作） to build a smooth-sided pyramid.

" Harry was compelled to resign and to come down to London, when he set up as an army coach（定从）." The relative clause in the sentence serves to _________________.

What is the function of the present progressive in " They are always calling me by the wrong name."

"If not us, who? If not now, when?" These two questions are used as _____________.

The bad news was that he could be a very dangerous person （将来虚拟）__________ he choose to be.

The woman has persuaded him to do _________ he had hired never to do--- reveal the combination for the lock on the entrance.

Protocol was （名词性从句）_______ enabled him to make difficult decisions without ever looking back.

Writers often coupled narration with other techniques to develop ideas and support opinions that otherwise ----abstract, unclear, or unconvincing

Members of the Parliament were poised_____________ ahead with a bill to approve construction of the oil pipeline.

________________ the attempted rescue mission, the hostages might still be alive.