根据括号内的要求改写句子。 1. I don't know what I shall do. (同义句) I don't know ___________ ____________ ___________. 2. Cycling is exciting. Skiing is exciting too. (合并成一句) Cycling is ___________ ___________ ___________ skiing. 3. There isn't anything else in the fridge. (同义句) There is ___________ ___________ in the fridge. 4. Peter is 1.70 meters tall. Mike is 1.68 meters tall. (合并成一句) _____________________________________________________ 5. Tom is smart, almost 1.75 metres . (对画线部分提问) _____________________________________________________