Sure! Here are the answers to your questions:

1. A situation in which one is watched by numerous others: This could be referred to as being “under scrutiny” or “in the spotlight.”

2. A problem that presents one with a difficult choice: This is often described as a “dilemma.”

3. A deadline or time limit placed upon a task: This is commonly known as a “due date” or “time frame.”

4. An assignment given by the leader of a group: This can be referred to as a “directive” or “task assignment.”

If you have more questions or need further clarification, feel free to ask!