QUES: They are a joy for anyone interested as I am in the public understanding of science

correct the punctuation.

CORRECTED: They are a joy for anyone interested as I am in the "public understanding of science".

QUES: This newly built complex on the hill side of Alanya consists of 5 detached and 2 semidetached triplex model villas with a private swimming pool

correct the punctuation.

CORRECTED: This newly built complex on the hill side of Alanya consists of 5 detached and 2 semi-detached triplex model villas with a private swimming pool.

QUES: You can select a seat free of charge in the following cases

correct the punctuation.

CORRECTED:
You can select a seat free of charge in the following cases: