Yes.
No if both parents are o+ they must produce o+ offspring
yes
normally they have "o" plus or negative.
If both parents have genotype AO, it is possible to have a type O child, but this is very rare.
O plus.
yes
Two parents with blood type A+ can have an O+ baby. If they do so, the parents are certainly heterozygous for type A.
Yes. O, Rh positive and B, Rh positive parents may produce an O, Rh positive child.
yes can
If both parents are O- then the child will be O-.
Yes, "b" and "o" are both blood types that are compatible for reproduction, so a baby's blood type could be a combination of the two parents' blood types. A healthy baby can certainly result from this pairing, as long as both parents do not have any genetic disorders that could affect the baby's health.
If you're asking if a person with bloodtype 0+ and a person with a+ have sex and can get pregnant, then the answer is yes.