I take my hat off to all those people who worked hard to get the contract.4/20Itakemyhatofftoallthosepeoplewhoworkedhardtogetthe contract.congratulateunrespectwelcomeencourageGiải thíchĐáp án B Giải thích: take my hat off (v) tôn trọng >< unrespect (không tôn trọng)