题目

In 2017, I began my service as a volunteer in a village in the West African nation of Benin. I expected to feel _______ during the holiday, longing for the _______ at home far in Canada. However, in Benin, I felt _______, mostly due to the people around me.Life in Benin was definitely _______. In addition to teaching five classes, I had to _______ a different living situation. There was no electricity or running water. As I grew more comfortable with life in Benin, I decided to _______ them to my house for a feast of a Beninese favorite: spaghetti omelets( 意大利面煎蛋饼) on Thanksgivin 在观察葫芦藓叶叶绿体分布的实验中： (1) 制作临时装片后，要注意临时装片中的小叶片应随时保持状态，保证观察的效果。 (2) 用显微镜观察时，应选用________光圈对光，先用________倍物镜观察。当镜筒下降时，眼睛应该________注视物镜。 (3) 若物像在视野左上方时，应将装片向________移动，使物像移至视野中央。再转动显微镜的________，将高倍物镜对准通光孔，并调节________，直到物像清晰，注意叶绿体的形态。 (4) 叶绿体位于细胞的________中，叶绿体呈________形，是进行________的细胞器。