I’m writing _____ my friend. [ ]

thecity’spublicschoolsystemshouldbeopentothechildrenofmigrantworkershas become the focus of discussion.

There’s ______ time left. You don’t need to hurry, Jack.—But I want to see her as early as possible.

Hearing the news about the crash of Air France Flight 447, he became very concerned _______ his daughter on board.

This pair of jeans looks nice ______ Sandy because she looks very nice ______ blue. [ ]