(a 1 Miras is planting trees in the park this weekend. Why don't we join in/up, too? 2 Ulan found a wallet on the street yesterday and he handed it out/in at the police station. 3 Hang on/out a minute and I'll come with you. 4 Sally hangs on/out with friends on Saturdays. 5 The cashier handed in/over £100,000 in cash. People were handing out/over leaflets about environmental protection in town today. 6