It rained heavily yesterday,___, he didn’t turn up at the meeting

ste water, when _______，should be clean enough to meet standards.

下列各句中，没有语病的一项是（ ）

_________they grow they make sure that what is left in the ground after harvesting_________a natural fertilizer for the next year’s crop.

What’s ____ _matter with you -I have ____ _ toothache.