S1.3: 2, 3, 5, 16. 

S1.4: 1(h-n), 6, 10(a,c).

S1.5: 1(a-h), 4(f-j), 12, 18, 24, 30.

=== Suggested problems (do not hand in):

S1.3: 12, 20, 22

S1.4: 1(a-g), 3, 7, 

S1.5: 14, 19, 25, 29, 31, 32.