1.Both and have
2.If are late
3.Neither nor knows
4.without her help
5.Not only but also is
6.didn't until
7.so had
8.heard from
9.strong enough to
10.too tired to
11.eithereach
12.did nothing
13.Either or
14.At the age of
15.It took
16.It's good
17To surprise
18.lent me