用现在完成时完成下列句子

Joho_____never____(visit) the USA

Mr Li _____(repair)over twenty cars since Monday

We _____(not see)each other for months

My parents_____(not come)back yet

Our Chinese teacher______(teach) us a lot about the history of China

Our city _____(change) a lot over the years 

Xiao Li ______(not write) to his parents yet

____they_____(hand) in their homework?Not yet 

We____(read) this book already