1 . This box only w__________ 2 kilograms. I can carry it easily.

2 . Lisa w______ nearly 75kg now because she eats too much junk food.

3 . The elephant w____ (重) about 5 tons.

4 . Oh, dear! Claudia w_________________ only 46 kilograms now. She has lost 5 kilograms.

5 . The human brain ________（weigh）about 1.4 kilograms, but it can hold much more information than most computers.