. --- My son is addicted to drugs. He isn’t hopeless, is he?--- Yes, ______ he mends his way and starts all over.
. Zhong Nanshan is a famous expert who has _____ to ____ the origin of SARS.
Do you know the girl _____ just now?
The mayor of Beijing says that all construction work for the Beijing Olympics___ now
None would have dreamed of there _____ such a beautiful place.
—You seem to have had that car for years. ---Yes, I should sell it ____ it still runs.