You have to wear special clothing, a helmet and a life jacket ____ your raft gets turned upside down or sinks.
. Tom kept quiet about the accident _______ lose his job.
. I felt it an honor _______ to speak here.
. ---I’d like to buy an expensive camera. ---Well, we have several models _______ .
. _______ to the left and you’ll see the post office.
. Will you be able to attend the lecturenext week?