Complete the text with the phrases below:

must wear • must be • should try • mustn’t let • shouldn’t enter • mustn’t fall

Athletes 1. shouldn't enter competitions before learning the rules of their sport, but some athletes don’t know them all. Here are examples of some rules:

• Runners 2. must wear shirts during races. A runner without a shirt loses the race.

• Gymnasts 3. mustn’t let people see their underwear. It 4. must be the same color as their clothes.

• In tennis competitions, players can wear a hat, but it 5. mustn’t fall off their head.

Athletes can lose competitions because they don’t know the rules, so they 6. should try to learn them.