Many birds stand ------the trees.on 还是in?按照外来物是用in 对不?

Many birds stand ------the trees.on 还是in?按照外来物是用in 对不? Many fruit are on/in the trees There are some birds in the trees对some birds 提问 there are many birds in the sky.对many birds 提问? I can see many birds in the tree.(对many birds 提问） Thare are many birds in the apple tree对many birds提问 There are many birds are singing in the trees over there.(改错 --- How many birds can you see in the trees? --- I can see b In fact there were many f____ oranges on the trees. _____ the trees some birds are singing.A.On B.At C.In They a In spring,we can hear birds -----(sing) in the trees There are many trees in the street.对many trees提问用啥?