ew difficulties _________ in yourwork, it’s always important to use your brains．

(2013·高考新课标全国卷Ⅰ)If we________now to protect the environment，we’ll live to regret it

Would you mind _________ in class

Tim, do your parents like football—___ my dad ___ my mum likes it. They both prefer tennis.

Your hobby got in the way ____ your study.