Fred knows that he can call upon his friends for help.

請問片語call upon是什麼意思？

請問空格中填入下列哪個單字或片語為佳？

Lucas is often【 】 for a famous singer.  

The fragile antique needed to be packaged carefully.

請問fragile(adj.)意指？

請問空格中填入哪個單字或片語為佳？

Many people in the country are trapped in 【 】 .