Lucy looks blue today.— Yes, but I don’t know what it is________makes herso upset. [ ]

I________invite Mr Green to the party that day, but he forgot it completely[ ]

This is the very letter ____came last night.

In that supermarket on sale is a new type of computer, _____ low price makes it attractive to the students from poor families

The magazine __________ be Lily’s， for we can find her name on the cover.