3 Choose the correct words to complete the sentences. 1 The children can go into the lake here because the water's very deep / shallow. 2 The boat went quite close to the cave / waterfall, but we didn't get wet. 3 It took us five hours to cross the desert / shore. I took some great photos of the sand. 4 My friend wants to climb Everest and two other high mountains / cliffs in Asia. 5 The trees in this forest are very low / tall, so I think they're really old.​