Exercise 1 solution

Example answer (yours will differ):
Sow a short length of the row (about a third) every 2 to 3 weeks from early spring until late summer, rather than the whole row at once. Each batch is ready as the previous one is used up, so there is no glut and no gap.
Use a cut-and-come-again mix. When the leaves are a few centimetres tall, pick the outer leaves, or cut about 3 cm above the base with scissors, leaving the growing point so the plant regrows for another cutting.
Keep the row watered, and shade it in hot spells so the plants do not bolt (run to seed). Pull up tired plants and resow in the gap.