It was on the farm _____he learned how to grow vegetables.
______ you may have, you should gather your courage to face the challenge.
That’s the factory _______we paid a visit last year.
The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.
All the travelers _____that they should bring their ID cards with them.
There is a big dog _______to a fence outside the house.