John ______ in his room when he heard screaming.
.The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
He has ______ little education that he finds it impossible for him to equal ______ important a task.
.China is playing an important role in the world. That’s_______Laura has come to study Chinese.
My friend showed me round the town, was very kind of him.
----How did you find your visit to Mountain Tai, John ? ----- _________.