Many teenagers feel lonely. You are not alone. In fact, it is very     1     for teenagers to feel lonely. This feeling is considered as growing pains — the difficulties that teenagers face while growing up.

As teenagers     2    , it becomes harder for them to deal with the changes both inside and outside. They experience great physical (身体的) changes. They grow     3     and their voices get deeper, among many other developments.

Along with these outside changes, there come many     4     changes. Many boys always want to take risks, but may not have the ability to make right     5    . When girls try to deal with their strong feelings, they often     6     someone to talk to.

In the social world, as teenagers get older, they try to depend     7     themselves. They may also need love badly at the same time. This will     8     trouble. They often question     9     they are and what they should do.

The good     10     is that these kinds of growing pains do not last long. In the end, everything will be OK — the teenager becomes a healthy adult. This period helps teenagers to become better.