She was the first woman ______ to the board.
—When did your cousin begin to show his interest in medicine?—It was a Saturday __________ she noticed her uncle experimenting on a frog in his lab.
Remember that there is still one point __________ we must make clear at the conference tomorrow.【选项 】
American women usually identify their best friend as someone __________ they can talk frequently.
Jenny was taken to the seaside as promised __________ she enjoyed herself very much.
The poor __________ living in the mountain __________ top is covered with green trees.