1 . 选择恰当的词组，并用正确的形式填空

make out;               base…on;                 let out;            be popular with;             in an attempt to;               in vain;                  be excited about

1. ________young people in Taiwan, many apps such as Xiaohongshu have awaken their desire to learn more about the mainland.
2. ________ stand out in fierce competitions, many break dancers combine Chinese culture with their moves.
3. With so many forms to fill in, the executive has been working the whole morning, his dog next to him________ a growl to remind him of the time.
4. ________true love and mutual understanding and tolerance, marriage can last for a lifelong time with happiness.
5. In the case, the detective had great trouble________ whose footprint it was on the crime scene, which was extremely impressive.