B. Lagyan ng angkop na panghalip-panao sa kaukulang palagyo ang pangungusap.
1. Sina Gng. Aragon at Go ay dumating na mula sa Manila.
2. Si Sam na ang bahala sa mga panauhin.
3. Sina Ann at ako ang tutulong kay Bb. Cruz.
4. Ikaw at ako ay magkaibigan.

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."

yes he did writing dots to make the answer