Which of these words or phrases in eah sentence are incorrect .........??? I"ll be so glad if  someone help me.............

 thanks

1/ many people predict that our relationships with food are ischanging as we learn   to make better food choices.

2/  there's a lecture about this tomorrow morning, but unfortunately, I can't                     be going because I'm taking an exam for anther class at that time.

3/ although my exam started at 8.00 and the lecture doesn't start until 9.00 I think it is taking me more than an hour to finish the exam.

4/ I know the exam is going to be very difficult even though I've been studying for it for the last five days, because all the other tests we've taken for that class have been difficult.

5/  however, I strongly recommend you attend the lecture because there aren't any more lectures on this topic scheduled and l believe this one is being particularly interesting.

6/ the story is that lsaac Newton was sitting under an apple tree when an apple was falling from a tree and hit him on his head.