20.what to do
21.too young to
22.hard enough
23.Use head and
24.Work hard or
25.too heavy for
26.too easy for to
27.without help
28.him playing
29.crying
30.to catch
1.so difficult can't
2.If don't
3.so that it
4.that we should
5.When soon
6.If you
7.because bad
8.when he was
9.you don't help
10.so can't it
11.when was
12.could we do
13.how can we
14.likes better than
15.Nobady else