(2) The load capacity of electric bicycle is about 100kg.
(3) The longest canal in the world is the Beijing-Hangzhou Grand Canal, with a total length of 1794 km.
(4) Xiao Ming is 153cm tall and weighs 27kg.
(5) The cover area of the math book is about 400 square centimeters.
(6) The garden area is about 10 square meter.
(7) 14 square decimeter = 1400 square centimeter;
So the answer is: tons, kilograms, kilometers, centimeters, kilograms, square centimeters, square meters, 1400.