Sentence 1: Alex is trying out for his school's baseball team. 
 Sentence 3: Alex works on his throwing skills for a few weeks 
 Sentence 4:  Alex has gotten very good at throwing 
 Sentence 5:  Alex's practice pays off and he makes the baseball team! 
 Option 1: Alex is not very good at catching. 
 Option 2: Alex is not very good at throwing.