Each guide was helpful, but we forgot to thank them.
You should use the plural pronoun, because we don't know whether the guides were only males, or females, or whether there were both sexes.
There are several critics on the issue of students taking snacks or food to class. Some teachers say that it will cause too much distraction, reducing student's ability to learn as they will share snacks and will be looking at what other students brought to class.
However, consider the fact that middle school learners are growing at an incredible rate. Their body needs energy and their minds get tired if they spend too much time withouth eating. Food is like fuel to the brain. Allowing snacks will actually increase sutdnet's ability to learn as it will take away the distraction of hunger.
Answer:
first one is right answer .
