Modals (can, must, should...)：练习题

Read the 'Snowflakes Wonderland' brochure. According to the 'Remarks' for House 1 and House 2, the room temperature is around \( 0^\circ\text{C} \). Visitors __________ wear warm clothing like a jacket to keep themselves warm.

According to the 'Snowflakes Wonderland' flyer, visitors __________ take a picture with the snowman they have made in House 1.

Children under 5 years old __________ be accompanied by an adult __________ they want to join the workshops, __________ the activities might be too difficult for them to do alone.

Little Tom is only four years old. He __________ go ice-skating alone; he must be with an adult.

According to the 'Snowflakes Wonderland' flyer, the room temperature in House 1 and House 2 is around \( 0^\circ\text{C} \). To avoid catching a cold, visitors __________ wear warm clothing like a thick jacket.

Fill in the blank with the correct modal verb (can, must, or should) to express ability:

"I am very strong. I ______ lift this heavy box by myself."

Rewrite the following school rule as a complete sentence using the modal verb mustn't:
Rule: No eating in the computer room.

In the sentence "We could go to the beach if the sun comes out," does the word could express a past ability or a future possibility? Explain how the sentence meaning would change if you replaced could with must.