l. They're used for seeing in the dark.(改为否定句) They ______ for seeing in the dark. 2. Liu Wei dong wanted to make Xiao y u happy.(改为一般疑问句) ______ Liu Wei dong ______ to make Xiao y u happy? 3.The potatoes are too salty.(改为感叹句) ______ ______ the potatoes are ! 4. Chinese people invented the abacus in the sixth century.(改为被动语态) The abacus______ ______ in the sixth century______Chinese people. 5. The children have never seen an Indian film, ______ ______?(完成反意疑问句)