宣布参加竞赛

• have his hat in the ring
• throw his hat in the ring
• threw his hat in the ring
• thrown his hat in the ring
• had their hat in the ring
• have your hat into the ring
• throw our hat into the ring
• have my hat into the ring
• threw our hat into the ring
• thrown our hat into the ring
• had our hat into the ring
• throw your hat into the ring
• threw your hat into the ring
• thrown your hat into the ring
• have their hat into the ring
• toss our hat into the ring
• throw my hat into the ring