______ being fun and good exercise ,swimming is a very useful skill.

---How do often you go to school?
---On foot_______it rains.

Many wines improve____ age, and it is the same with friendship.

I’m sorry I didn’t phone you, but I’ve been very busy____ the past couple weeks.

On the graduation day, he received from his father a nice present       a note was attached, saying “I’m proud of you.”

________________ invited, I won’t go traveling with them because I’m busy these days..