It is uncertain ___ side effects these weight-loss drugs will bring about, although hundreds of thousands of patients have taken it.

On the celebration of the university’s 100^th birthday, he said, “I have never experienced __________ time here as a graduate of Tsinghua University.”

Only when    to explain  thereasonfor this.

Large earthquakes __________ the ocean can create a series of huge, destructive waves called tsunamis that flood coasts for many miles.

He is so addicted to smoking that ________ seems to be no chance of talking him into quitting.

--- He is a very hard-working student．

---________．As far as I know, he often burns the midnight oil．

---Has anything caught your eye in today’s newspaper?

---Yes. A new eight-kilometer-long road is under ________ that links the port area with the motorway system.

– Will you be able to see Jennifer’s parents when the first class is over?

– I’m afraid not. I ______ a lecture on British literature in the hall.

Jane is determined to go to France for further education _______ all the possible consequences.

--- An explosionata coal mine killed at least62workersandleftanother13 missing.

--- Yes,   news came as    shock tous all.