如图所示，港口B位于港口O正西方向120km处，小岛C位于港口O北偏西60°的方向．一艘游船从港口O出发，沿OA方向（北偏西30°）以vkm/h的速度驶离港口O，同时一艘快艇从港口B出发，沿北偏东30°的方向以60km/h的速度驶向小岛C，在小岛C用1h加装补给物资后，立即按原来的速度给游船送去．

    Mr. Klein told the class that a new student, Inez, would join them soon. He 1 that Inez was deaf. She “talked” with others by using sign language. Mr. Klein knew sign language, and he decided to teach 2 students so that they could also “talk” with Inez.
    First, they learned to sign the letters. Some letters were hard to3 . Other letters, such as C ,were easier because the shape of the hand was the same as the shape of the letter.
    The 4 thing they learned was finer spelling. They signed one letter after another to spell a word. They5with two-letter words such as at and on . Then they spelled 6words.
    Finally, Mr. Klein showed that 7 one sign could be used for a whole word. To make the sign for the word fine, a person spreads out the fingers on one hand, 8 the thumb(拇指) to the chest(前胸) , and moves the hand away from the chest. Signing is not just done with the hands. Expressions on the face are also9  . The students learned to sign a question mark by using expressions on the face.
When Inez first entered the classroom. She looked  10 . But the students signed, “Good morning, Inez. ” She gave the class a big smile and signed back, “What a wonderful welcome !”

给划线的字注音。