1.b
a, 'gravity b, de'posit c,'pyramid d, 'colorful
2.a
a, in'dustrial b, exhi'bition c, prepa'ration d, deco'ration
3.d
a, 'brilliant b, 'insect c, 'lunar d, pro'ceed
4.a
a, 'reference b, im'portant c, re'fusal d, de'cision
5.b
a, cu'rriculum b, 'tropical c, hi'storical d, gram'matical