The glue is non-toxic. You still can't eat it, but at least it's non-toxic.
Answer:
Dear Smith Family,
During the pandemic, I wasn't able to do fun things like going to the cinema or go to my friends birthday parties. All I could do was watch tv, clean the house , going to do online school and playing video games. I wish you and your family the best and stay strong.
Sincerely,
Their
I think that's what you're asking for?
Use of subordinate clauses is more of a grammatical thing, and if the writer is not sure if a sentence is correct he/she may ask a peer reviewer to edit or comment on it. However, the body of the essay is a standard for every essay assigned and it should be much easier for the writer to tell if he/she is following the rules.
