Correct the following statements:
$(a)$ Surgical methods of contraception prevent gamete formation.
$(b)$ All sexually transmitted diseases are completely curable.
$(c)$ Oral pills are very popular contraceptives among the rural women.
$(d)$ In $E.T.$ techniques, embryos are always transferred into the uterus.

$(a)$ Surgical methods of contraception prevent gamete formation.
Correction: Surgical methods of contraception block the transport of gametes, not their formation.
$(b)$ All sexually transmitted diseases are completely curable.
Correction: Some sexually transmitted diseases are curable if detected early and treated properly, but diseases like $AIDS$, $Genital \text{ } Herpes$, and $Hepatitis-B$ are not completely curable.
$(c)$ Oral pills are very popular contraceptives among the rural women.
Correction: Oral pills are more popular among urban women due to better awareness and accessibility.
$(d)$ In $E.T.$ techniques, embryos are always transferred into the uterus.
Correction: In $E.T.$ (Embryo Transfer) techniques, embryos with up to $8$ blastomeres are transferred into the fallopian tube $(ZIFT)$, whereas embryos with more than $8$ blastomeres are transferred into the uterus $(IUT)$.