They had a pleasant chat _____ a cup of tea.

The traditional approach ________ with complex problem is to break them down into smaller,
more easily managed problems.

短文改错
       此题要求改正所给短文中的错误。对标有题号的每一行作出判断：如无错误，在该行下边横线上画一个勾;如有错误(每行只有一个错误)，则按下列情况改正：
        此行多一个词：把多余的词用斜线(\)划掉，在该行下边横线上写出该词，并也用斜线划掉。
        此行缺一个词：在缺词处加一个漏字符号，在该行下边横线上写出该加的词。
        此行错一个词：在错的词下划一横线，在该行下边横线上写出改正后的词。
        注意：原行没有错的不要改。
     An old friends of mine from Beijing telephoned from                      1.________
the airport to tell me that he has arrived. I was still at the                     2.________
office at that time. I told him which my house was and that                  3.________
I had left the key under the doormat. I asked for him to                      4.________
make him at home. Two hours later, I telephoned him.                        5.________
He told me he couldn't find the key under the doormat, and                6.________
he  had no difficulty in entered my house, because the                         7.________
window of my living room was just by the apple tree, and                   8.________
he had climbed in. I was surprised. There has no                                9.________
apple tree in front of my living room, but there is
one on front of my neighbour's.                                                          10.________

Mr Song is ______ our school，that is to say，our school is ______ Mr Song.

Einstein is known _________ a great scientist.