Vocabulary 1 Match the sentences halves. 1 There's a lot of ice outside a don't fall off 2 That box is heavy 3 The iron is hot 4 This knife is very sharp your bike. b don't cut your finger. don't hurt your back. d don't burn your hand. 5 The cupboard is very low e don't slip on it. 6 Ride carefully f don't bang your head.