They said they（）their own job． ["finished","would finish","have finished","had finished"]
Modern science and technology has （）communication between people far apart． ["made convenient","made it convenient","made it convenient for","made it convenient to"]
在解决合同纠纷时，当事人选择用仲裁的方式解决争议，就不能再向人民法院起诉。
1958年联合国海洋法会议，制定的公约有（）。 ["《联合国海洋法公约》","《公海公约》","《大陆架公约》","《领海与毗连区公约》"]
当今英国的权力中心是（） ["国王","首相","上议院","下议院"]
符号有哪八个基本视觉变量？
