- Was it because of his laziness_______ he didn't do the experiment successfully?- No, it was because of his carelessness.
It is ________ the customers' needs that has made chain stores so popular in big cities in China.
--- What ______ when I phoned you? --- I ______ my work, and I wanted to go out.
---I have _______that he will continue to rise to the challenges ahead. ---Absolutely.
He is taller than he______.
sales of cars up by 30% last year, the traffic in Beijing has become increasingly terrible.