1.Climbing is tiring but enjoyable,anyway.
2.National railway industry manages well(in china).
3.You won't catch the bus as all busses set off on schedule.
4.The young soldier jumpped into the water to save the child regardless of his own safety.
5.The company will arrange for a taxi to collect/meet you.(或“pick you up")
6.While I admit that there are problems,I do not agree that they cannot be solved./While I admit the existence of problems,I disagree that they are unsolvable.