Please translate the following sentences into English.
1.学外语不容易。
2.很抱歉让你久等了。
3.除了接受这个事实我别无选择。
4.他醒来发现大家都走了。
5.他到了上学年龄了。

[Writing] 1.It's not easy to learn a foreign language. 2.I am sorry to have kept you waiting. 3.I have no choice but to accept the fact. 4.He woke up to find everybody gone. 5.He is old enough to go to school.