Hi Keith, Jane and Sally,

Thank you for the responses. They are all very helpful.

It seems that the best way is to
1. wait for the best introduction offer,
2. buy one book bimonthly for 4 times, but remember to cancel the Editor's
choice if I don't want it.
3. after fulfilling the requirements, cancel the membership.

If there are enough attractions in the next introduction offer, repeat the
procedures again.

Thank you for help again.

With regards,
CK