Choose the word or phrase - a, b, c, or d – that best fits the blank space in the following passage.

During the (16) _________ years, many young people can at times be difficult to talk to. They often seem to dislike being questioned. They may seem (17) _____ to talk about their work at school. This is a normal(18) ________ of this age. Though it can be very hard for parents to understand, it is part of becoming (19) ___________ of teenagers trying to be adult while they are still growing up. Young people are usually unwilling

to talk if they believe, that questions are trying to (20) ____________ up on them

Parents should do their (21) ____________ to talk to their son and daughter about school, work and future plans but should not (22) __________ them to talk if they don't want to. Parents should also watch for danger signs.

Some young people in trying to be adult may (23) _________ with sex, drugs, alcohol or smoking. Parents need to watch for any signs of (24) ________ behavior which may be connected with these and help if (25) ____________

Which is not Marie Curie's achievement?