1.Mom always (____) her glasses down somewhere and then can't find them.

2.No one could believe that Carol had been (___) near the dog the entire time.

Use correct form of sit or set

1.sets
2.sitting

1.My grades have (----) a little each semester.
2.My father jokes that he (___) at dawn each morning and walked ten miles to school.
3.The tale was so scary that the hairs on the back of her neck (___).

Use correct form of rise or raise

1.raised
2.rose
3.rose

1. snow (___) like a blanket over the fields.

Use lie or lay

1.laid

My grades have...

and
snow ____

Those two are incorrect. All the others are correct.

My grades have risen

snow lay

Right. Now they're ALL correct.

1. Mom always sets her glasses down somewhere and then can't find them. (Use "sets" because it refers to the action of placing the glasses down.)

2. No one could believe that Carol had been sitting near the dog the entire time. (Use "sitting" because it describes the continuous action of Carol being in a seated position.)

1. My grades have risen a little each semester. (Use "risen" because it describes the action of increasing.)
2. My father jokes that he rose at dawn each morning and walked ten miles to school. (Use "rose" because it describes the action of getting up in the morning.)
3. The tale was so scary that the hairs on the back of her neck rose. (Use "rose" because it describes the action of the hairs on the back of her neck standing up.)

1. Snow lay like a blanket over the fields. (Use "lay" because it describes the state or position of the snow lying on the fields.)

Please note that "lie" is used to indicate a person or thing being in a horizontal position, while "lay" is used to indicate the action of placing or putting something down.