规划整个项目时，你必须考虑时间因素。

You've got to ___consider the time element when planning the whole project.

如果你考虑他学钢琴多久了，他并不很好。

If you ___consider how long he's been learning the piano, he's not very good.

如果你买一栋老房子，你必须考虑维修费用。

If you buy an old house, you have to ___consider the cost of repairs.