We have to install new water pipes in our house; these are corroded.A．worn thinB．worn away

If these new methods don’t work，we’11 have to__________our old system．A.fall through###SXB

We have to ________the cost of setting up a new hospital in that area.A.work outB.fill upC

听力原文：How is the new secretary we hired doing her job？（A)I think we have to hire her.（B

We have made up laws to protect the water from being polluted and the animals _____

The text suggests that in the future we _______.A. may have to fight against more new

We have to ________the cost of setting up a new hospital in that area.A.work outB.fill upC