By installing a birdbath, the birds were given a source of water．

Use less hot water _____ installing low-flow shower heads.

Cost of installing a new production machine A: Asset B: Expense

The workers are a heating system. A: inspecting B: inspiring C: installing D: instructing

Half of the fee for installing the kitchen appliances should be paid in ______ . A: progress B: advance C: signature D: wage

For households looking to adopt solar technology, using photovoltaic panels installed on the roof is generally more cost-effective than installing a solar water heating system.

For households looking to adopt solar technology, using photovoltaic panels installed on the roof is generally more cost-effective than installing a solar water heating system._

Prestressing by（）involves installing and stressing prestressing strand of bar tendons only after the concrete has been placed, hardened and attained a minimum compressive strength for that transfer.

The purpose of installing electric eyes along the main roads is to make sure that all vehicles ______follow traffic rules. A: [A] cautiously B: [B] dutifully C: [C] dubiously D: [D] skillfully

Which of the following custom is practiced after the wedding ceremony? ________ A: Installing the bridal bed. B: Combing hair for the bride. C: Paying respect to the groom’s family ancestors. D: Crying for the marriage.