Ⅰ.根据括号内提示，写出所缺单词的恰当形式
1．If the opportunity ________(arise)，I'd love to go abroad for further study.
2．My father will buy me a(n) ________(electricity) dictionary if I get good results in the final exams.
3．We should not judge a person by his ________(appear)．
4．This afternoon I will ________(打字) the letter for you.
