高中阶段是人生中的关键时期,我们必须珍惜时光,集中精力努力学习。从唯物辨证法角度,这就是说要( )
I was told that there were about 50 foreign students __________ Chinese in the school, most __________were from Germany.
We saw several natives advancing towards our party, and one of them came up to us, __________ we gave some bells and glasses.
Look out! Don’t get too close to the house __________ roof is under repair.
Women __________ drink more than two cups of coffee a day have a greater chance of having heart disease than those __________ don’t.
The owner of the cinema needed to make a lot of improvements and employ more people to keep it running, __________ meant spending tens of thousands of pounds.