1.The trouble is         that       I can’t find my way.

2.Without his support, we wouldn’t be         where/what       we are now.

3.This is         what       my father has taught me-to always face difficulties and hope for the best.

4.By boat is the only way to get here, which is         how       we arrived.

5.He got caught in the heavy traffic. That was         why       he was late.

6.Energy is         what       makes things work.

7.We didn’t set out; it was         because       we wanted to wait until our mother came back.

8.The most pleasant thing of the rainy season is         that       one can be entirely free from dust.

9.   It       sounds as if/though someone is knocking at the door.

10.What cost him his life was         that       he was too careless.