Choose the correct word for the given Chinese._______免费赠送的

A. complimentary
B. complementary

Choose the correct word for the given Chinese._______衬垫

A. backing
B. backee

Choose the correct word for the given Chinese._______领款人

A. payer
B. payee

Choose the correct word for the given Chinese._______海归

A. returner
B. returnee

Choose the correct word for the given Chinese._______议员

A. congressman
B. congrademan

Choose the right words to fill in the blanks.