16 Country folk can tell you that there are certain places which animals avoid.
17 Kindness is the golden chain by which society is bound together.
18 This is an enormous field of which l can here touch only the fringe.
19 The resin from which the oil is extracted comes from a small, tough tree.
20 He wrote a novel which slanted toward young adults.
21 People will trade down to own labels which are cheaper.
22 There are few known diseases which are not susceptible to medical treatment.
23 There are many emergencies which need prompt first aid treatment.
24 He's awaiting trial, which is expected to begin early next year.
25 There are recognised black spots in marriages which can lead to trouble.
26 Try making a note of the things which annoy you.
27 This type of wool is woven into fabric which will make jackets.
28 That is not good language which all understand not.
29 The cell is the unit of which all living organisms are composed.
30 Don't look upon the vessel, but upon that which it contains.