The book was written in 1946, __________ the education system has witnessed great charges.
—what do you think of Bill? —He is a hard-working student and he always ____himself in study.
_____ I shouted at the top of my voice _____ turn his head.
—How did you find him out? —I ______ his name by chance on the list.
---Is there any present for me ? ---Of course .This necklace __you .
The gravity on the earth is much ______ that on the moon, do you know why?