The research is so designed that once _______ nothing can be done to change it.
| A．begins | B．having begun | C．beginning | D．begun |
Several hours later, with the help of the police, the students managed to escape from the dangerous place, _______.
| A．hungry andfrightened | B．hungrily and frightening |
| C．hungry and frightening | D．hungrily and frightened |
That light rail transit line(轻轨), __ _in July 2009 and ___ in 2012, will be China’s longest light rail transit line in history.
| A．starting, completing | B．started, to be completed |
| C．to start, completed | D．starting, completed |
Annie often tells her classmates ______ at the remote school in the mountain area and what she has done there as a volunteer.
| A．life is how hard | B．what hard life is | C．how hard life is | D．how hard is life |
.—IgotanemailfromSusan, ______saidUshewasgoingabroadforsightseeing.
—Fantastic!That’swhatshehasbeendreamingof.
| A．which | B．she | C．who | D．it |
--- Remember the first time we ______ , Peterson?
--- Of course, I ______ . We’ve been close friends ever since.
| A．met; do | B．met; did | C．had met; did | D．have met; do |