Visit Hong Kong, Macu and Shenzhen. What do I need to submit to obtain the visa?

To go to China mainland like Shenzhen, each person needs to obtain a china tourist visa and the requirements for a China tourist visa include: passport and copy of the first three data pages; completed visa application form V2011A; one recent passport photo; Invitation letters in Chinese language by individual/entity in China and six-month bank statement. Persons never been to China should submit the requirements in person. It takes about 4 working days to process a china visa.
To visit Hong Kong, you need to apply for Hong Kong visit visas too. Here is the detailed info about Hong Kong visit visa: http://www.immd.gov.hk/ehtml/id1004.htm
To visit Macau, you also need to apply for Macau visa. THe requirements include: A completed Macau Visa Application Form; Photocopies of the bio data page and used inside pages of a valid passport/travel document; Document of financial status (e.g. bank statement, deposit in savings account, tax payment receipt, employment certificate, etc.) ;Document of transportation to Macao and accommodation arrangement (e.g. round-trip air ticket and hotel room reservation receipts, etc.);Recent 1.5-inch full face white background color photo; tour receipt, itinerary, etc. Hong Kong visa and Macau visa usually takes 4 weeks to be processed.
All of the above mentioned visas can be obtained from China embassy in Bangladesh.