中国航天业的发展,离不开千千万万技术人员、工人的辛勤劳动,也离不开航天员的巡天。这充分说明( )
It rained heavily overnight and not until this morning____.
--Do you know what caused the accident? --- No, not yet. The matter _____.
A new museum is being built in our city and it’ll be accessible to the citizens when___ next year.
Robert failed to complete his education____ he found it hard to focus on his studies.
We live in a society_____ there is a great deal of debate about competition.