He made a(n)______ that he would buy a large house for his parents when he became rich.

The new shopping center _____ now will beput into use by the end of this year

The directions for operating this machine were so______ that we could not understand

My son has gone abroad. I’m looking forward tohim _________.

We can hardly ________ what he really means on this controversial problem, as he doesn’t show his clear stand to anyone of us.