chemistry:valence bond

Cannot figure these Qs, Pls help.

1.Which of the following has a pyramidal structure?
ClO3-
ClO4-
ClO2
ClO2-

2.All of the following molecules are linear except
CS2
HCCH
HCN
HOOH

3.Based on the VSEPR theory, what is the molecular shape of SCl3F?
linear
see-saw
T-shaped
bent

4.Based on VSEPR theory what is the molecular shape for a molecule with the general formula AX2E?
bent
see-saw
T-shaped
trigonal planar

5.What is the molecular shape of HOF as predicted by VSEPR theory?
trigonal planar
tetrahedral
bent
trigonal pyramidal

6.Which of the following has no net dipole moment?
NF3
TeO3
N2O
H2Se

7.Which of the following is a hybrid orbital?
3d
sigma
sp2
pi