Chia dạng đúng của từ: listen! The bird ... (Sing ). Trees (plan) ... since it (srop) ... raining

1 listen! The bird ...(Sing ) 
2 trees (plan)....since it (srop).....raining
3 by the end of last march. I (study).......english for 5 years 
4 he often (stay)...........O.K when he (taik)..........with the guests
5 how long you ........(wait) for me ? Just a few minutes