This is one of the foods that my doctor has forbidden me （）.

单项选择题（） the baby fell asleep （）the room.

A．After; did the mother leave
B．Not until; did the mother leave
C．When; did the mother leave
D．Until; did the mother leave

单项选择题（）scientists understand how and why earthquakes happen, forecasts are usually inaccurate.

A．As
B．While
C．For
D．Since

单项选择题I had worked here （）you came here. But l shall leave for England（）.

A．before long; before long
B．before long; long before
C．long before; before long
D．long before; long before

单项选择题The population of China is （）the United States.

A．much larger than that of
B．moremore larger than that of
C．much larger than
D．moremore larger than

单项选择题Leave the next two lines （）for the tutor’s comments.

A．blank
B．to beto be blank
C．being blank
D．be blank