根据以下资料，回答17~20题。
Read the following:
1．Needed: Full time secretary position available．Applicants should have at least 2 years experience and be able to type 60 words a minute．No computer skills required．Apply in person at United Business Ltd., 17 Browning Street.
2．Are you looking for a part time job? We require 3 part time shop assistants to work during the evening．No experience required, applicants should between 18 and 26．Call 366-76564 for more information.
3．Computer trained secretaries: Do you have experience working with computers? Would you like a full time position working in an exciting new company? If your answer is yes, give us a call at 565-987-7832.
4．Teacher Needed: Tommy's Kindergarten needs 2 teacher/trainers to help with classes from 9 a.m．to 3 p.m．Applicants should have appropriate licenses．For more information visit Tommy's Kindergarten in Leicester Square No．56.
5．Part Time work available: We are looking for retired adults who would like to work part time at the weekend．Responsibilities include answering the telephone and giving customer's information．For more information contact us by calling 897-980-7654.
6．University positions open: The University of Cumberland is looking for 4 teaching assistants to help with homework correction．Applicants should have a degree in one of the following: Political Science, Religion, Economics or History．Please contact the University of Cumberland for more information.
Which position is best for Margaret Lillian who is 21 years old and would like a part time position to help her pay her university expenses? She can only work in the evenings．
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