1.I am most grateful to my parents, __who__ are always there to encourage me and care for me.
2.Much of his youth was spent in Beijing, __where__ he developed an interest in Beijing Opera.
3.__As__ is known to all, it takes more than good looks to succeed as an actor.
4.There are plenty of good pubs and clubs in this area, most of __which__ are friendly and safe.
5.The sports meeting will be put off till next month, __when__ we will have made all the preparations.