So difficult ______ it to live in an English-speaking country that I determined to learn English well[ ]

Biology is my favourite subject.—Mr. Green teaches __________ Biology, I guess. He teaches so well.

We’ll study in different schools next term. Enjoy your time in the new school.— .

The reason why I didn’t go to Shanghai was ________ a new job.

People who exercise _______________ are less likely to feel stress