1¡¢She was silent for a while, lost in thought, ____________ (stare) at the books on the desk.

2¡¢The girl is so grateful whenever she remembers my brother and me ________ her from the icy water.

A. to have saved   B. to save   C. saving   D. saved

3¡¢The birthday will be held in the garden, weather           .
A.permitting
B.to permit
C.permitted
D.permit