While traveling in the frontier region, he ( ) many popular songs that are still sung today.

(单选题)Who is exempted from attending the workshop? ( ) (单选题)What is the purpose of the e-mail? ( ) (单选题)How many days will the workshop last? ( ) (单选题)What is mentioned about the workshop? ( ) (单选题)How many days after the store sent out its bill did Ms. Jone (单选题)When should Ms. Jones contact Julie London? ( ) (单选题)What caused the problem to occur? ( ) (单选题)What is suggested about Ms. Jones? ( ) (单选题)What is the purpose of the first letter? ( ) (单选题)When was this e-mail sent? ( )