Cho cấp số nhân \(\left( {{u_n}} \right)\) với số hạng đầu \({u_1} = 2\) và công bội \(q =  - 2\). Tổng 9 số hạng đầu của cấp số nhân \(\left( {{u_n}} \right)\) là 

Read the following advertisement and mark the letter A, B, C, or D to indicate the option that best fits each of the numbered blanks from 1 to 6.

Solo Female Travelers Club – Global Greeter Network

    Looking to enhance your travel experience with a local perspective? Join the Global Greeter Network, a service (1) ______ to connect travelers with friendly locals eager to (2) ______ you around. Whether you’re (3) ______ in a guided tour, a scenic walk, or simply being dropped (4) ______  at a spot of interest, this program offering flexible options allows you to explore new destinations without the hassle of finding transportation. Perfect for solo female travelers wanting (5) ______ locals and like-minded explorers, the Global Greeter Network provides access to exclusive travel groups. Share experiences, make friends, and discover hidden gems. This service is designed for those eager to experience (6) ______ in a safe, comfortable way.