We seem to have a lot of problem with those even if we have more good materials than in the past .
We seem to have a lot of problems with those even though we have better materials than we did in the past . We seem to have a lot of problems with those even if we have better materials than in the past . We seem to have a lot of problems with those , even though we have more good materials than in the past . We seem to have a lot of problems with them even if we have more good materials now than in the past .