__ more careful, the work might havebeen done better

Each member country of WTO must ________ itslaws and regulations and compete on the principle of fairness and cooperation

It was an exciting moment for these football fans this year, _________ for the first time in years their team won the World Cup.

He is the lawyer who you took photos ____ you were in the Forbidden City.

In writing a composition, there must not be one sentence or even one word which is brought in ______.[ ]