要解释Physics_(be)so difficult for me that i can it pass it every term

要解释Physics_(be)so difficult for me that i can it pass it every term
The Smiths_(be)fond of going to the movies on weekends
Neither she nor her two sister_(be)interested in playing the guitar
I think two months_(be)quite a long time—Yes,i am afraid that she will miss a lot of lessons
What you ever done_(be) very important to all of us
This pair of shoes_(be)Sarah is.My shoes_(be)under my bed
Both of my parents_(be)teachers
Jenny is the only one of the students who_(be)from American in our school
The teacher and writer_(be)coming to our school to give us a talk
Nothing_(be)difficult in the world if you put your heart into it
There are fifty students in our class ;two thirds of them _(be)boys
Every boy and every girl_(want)to go there