The engineer ______my father works is about 50 years old.
I didn’t see her in the meeting room this morning. She _______ at the meeting.
The boy decided to climb the mountains _______ he knew he would face many difficulties.
China has been pushing the reform of public hospitals _______ all its citizens.
In many people’s opinion, that company, though relatively small, is pleasant _______.
Let’s not wait any longer, he might not _______ at all.