I'm glad to get a letter from you.They love playing basketba

I'm delighted/happy to receive your letter.
I'm happy to have your letter.
It is nice to receive your letter.
It is nice to have/get a letter from you.
.
They adore playing basketball.
Playing basketball is their favorite.
Playing basketball is their most favorable hobby.
.

I am happy to receive you letter.

收到你的信我很高兴
他们非常喜欢打篮球

I'm happy to recieved a letter from you.
They have interest in playing basketball.