t have passed this way, _____here arehis footprints

He has _______ for two years.. Two years _______ a long time.

Nowadays many young girls are losing weight, so they eat ________ food. [ ]

It is uncertain ________ side effect the medicine will bring about, although about two thousand patients have taken it.(2010·浙江)

Have you seen Jack recently?—NoHe for another company now