Ⅰ.单词拼写
根据汉语或首字母提示，写出下列单词
1．The Yangtze river is a natural barrier(屏障) to the northeast.
2．Upon hearing his words，my initial(最初的) reaction was to decline the offer.
3．The incident left permanent(长久的) traces on his mind.
4．There is a natural phenomenon(现象)that scientists call the “greenhouse effect”．
5．You'd better not pick those tomatoes—they're not ripe(成熟的) yet.
6．He pressed the juice out of the fruits.
7．The laughter faded when they saw the teacher coming.
8．Time does not permit me to stay here any longer.
9．The river is the boundary between the two countries.
10．I bought a model of the Eiffel Tower as a souvenir of Paris.
