He had been so absorbed____ watching the car passing by that he didn’t notice his friends ____.

When I came in，I saw her ________ in the sofa ________ in thought．

_____ wealthy people with the business tax instead of the individual income tax weakens government efforts _____ the wealth gap.

The project, ______ by the Chinese engineers, was built in only two years.

Varieties of household goods are sold here, ____from babies’ toys to old men’s walking sticks.