ysics teacher and English teacher always givetheir lessons in a lively and clear way,____ greatly benefits us students.

I went to the hot spring and enjoyedmyself—________．You looked tired last time I saw you．

This is ______ my parents are worrying about.

f the roadswere covered with thick snow, ____ made our journey more difficult

Without honest analysis they are not ______to improve the present situation. [ ]