I walked into our garden, _______ Tom and Jim were tying a big sign onto one of the trees.
—How long do you suppose it is ____ he? —No more than half a week.
___ China’s reform(改革)and opening up in fate 1978, its quick development has aroused worldwide attention.
We were told that we should follow the main road ___ we reached the central railway station.
Scientists say it may be five or six years ___ it is possible to test this medicine on human patients.
Tom’s and Joan’s ____ came to London last week.