(2013·大纲卷)A serious study of physics is impossible some knowledge of mathematics.
around Tian’anmen Square, the tourists were taken to visit the Palace Museum.
The professor ________ you at the party was my tutor (导师).
There are many old trees in our school, each ________ about 100 years ago.
We should put away all medicines out of reach of children and make sure they are not left ________.
________ in an atmosphere of simple life was what her parents wished for.