Grades are really important, but they’re not ______to us students.

I got home _____ they were having dinner.

Instructions for homework have to be ____ so that every student knows clearly what is to do after class.[ ]

ience Museum, ____________ we visitedduring a recent trip to Britain, is one of London’s tourist attractions.

There is no power like ________ power of confidence; and there is no one as competitive as ________ person who trusts his own abilities.