Ihave to use 10 word in sentence. can you make sure the sentence structure looks good ?

1- (incidentally), i got my license before i buy my own car
2- i used to (assimilated) and understand the new word before i can explain it to other
3- who has interesting in dissolve materials, must have his own (crucible) witch facilitate his work

4- i spend a lot of time reading about the german (reunification) and its more historical than i was think
5- i have a friend whose american (descent) but can speak more than four language

6- you can be a (bilingualism) person if you study hard
7- (cultural pluralism) to formation an excellent environment to make new friends
8- stone-built houses is one of the most important (heritage) symbols in my country
9- i have been a student at the american english (institutions) for couple months ago
10- there are many (hypotheses) that precede the inventions that we know