Ответ:

1. Fred wants to go to Spain, but he doesn’t have enough money to buy the ticket.

Fred wishes he had enough money to buy the ticket to go to Spain.

2. Alice doesn’t have any free time so she rarely goes out with her friends.

Alice wishes she had more free time.

или

Alice wishes she could go out with her friends more often.

3. Tracy’s favourite actor is Colin Firth and she wants to meet him.

   Tracy wishes she could meet Colin Firth.

4. It rains all the time here and I don’t like it.

   I wish it didn't/wouldn't rain all the time here.

5. Melissa likes Chinese food, but she doesn’t know how to cook it.

    Melissa wishes she knew how to cook Chinese food.

6. There aren’t any shopping centres in the area, and Tina doesn’t like it.

  Tina wishes there were shopping centres in the area.

Объяснение:

В этих предложениях речь идет о настоящем. Для выражения желания используется оборот I wish (he/she wishes) + Past Simple / Past Continuous.

Время Past Simple в придаточной части используется, когда речь идет о фактах или статичных действиях, а Past Continuous - о процессах.

I wish + would + глагол в первой форме

Такая конструкция передает недовольство существующим положением дел, раздраженное желание изменить ситуацию в будущем, жалобу.