【温故知新】 1. 用but和however完成下列句子，并体会两者的区别。 ①The report shows that we are making some progress ___ that we need to make greater efforts. ②In the last ten years in China, 150 million people moved out of poverty. ________, the challenges are still great. ③I really don’t like cheese，___ I will try just a little this time. ④It was raining hard. We went out to look for the boy, ________.

but

However

but

however