國中英語基測出現過 when 的考題。

1.
From the ad, which is true about Sunny Sun pictures?
You cannot get Sunny Sun pictures when you buy books.
You cannot use Sunny Sun pictures to get free desserts.
The last day to collect Sunny Sun pictures is Feb. 10.
The first day to use Sunny Sun pictures is Feb. 4.
2.
Sammy has 7 Sunny Sun pictures. She wants to get a Sunny Cup. How can she get one?
Use 6 Sunny Sun pictures and pay $200.
Spend $150 to get 3 more Sunny Sun pictures.
Spend $200 to get 4 more Sunny Sun pictures.
Use 6 Sunny Sun pictures and pay $100.