My father worked day and night. Otherwise, there ________ no one to support the family.

 But for water，it ______ possible to live in the desert．

— It’s the office! So you ______   know eating is not allowed here.— Oh, sorry.

To qualify yourself for this kind of new job, I recommend that you ________ some online courses.

It has been announced that passengers ____ remain in their seats until the dangerous subjects have been removed.