One of the waiters _________ my uncle.

The specialist, ______ some of his assistants, ____ to attend our discussion.

 The sign on the right tells us taking photos ________here. 

The university estimates that living expenses for international students ________ around $8,450 a year, which ________ a burden for some of them.

Mr. White as well as his friends ________ a number of countries in the past few years.