Because of the Russian gas limit to Europe, attempts _______ to use botanical fuel as a source of power.
. Some of the suspects(嫌疑犯) ________ refused to answer and kept their mouths shut.
Before the war broke out, many people ________ in safe places possessions they could not take with them.
________ the truth, I don’t like to be laughed at ________.
Each player of chess is trying to trap the other player’s king into a position _________ escape is impossible.
She is always ready to help people in trouble. She thinks it a ________.