_______, he doesn’t study well.

--- Are you worried about her safety? --- Just ________. She isn’t alone.

Chemical pollution will bring about a threat to agriculture and food chain, and ________ to human health.

____ the search engine just gave me some brief introductions rather than the whole content of the book to read.

_____, he together with his families ____ escaped from the shaking building when the earthquake struck Lushan County of Ya’an.