根据提示将下列英语句子进行升级训练
1. The school life is stressful．I am full of confidence．（用状语从句合并为一个句子）
→________________________，I am full of confidence．
2. Mr Hu is very strict with us in our study His classes are very interesting．We are impressed with his classes．（用but，so．．．that．．．合并为一个句子）
→Mr Hu is very strict with us in our study________________________we are impressed with them．
3. I am a young teacher．My students saw me enter the classroom．They began to make more noise．（用现在分词作状语改写句子）
→________________________，my students began to make more noise．
4. There are 52 students in our class Most of them come from the countryside．（用定语从句合并为一个句子）
→There are 52 students in our class，________________________come from the countryside．