Evidence of a powerful volcano, which erupted under the ice sheet of West Antarctica around 325BC and might still be active now, __________ so far by British scientists.
____________ great help, I could get rid of all the difficulty and succeeded.
The reason__________ their failure you know is _____they didn't get fully prepared for the experiment.
--Why has he been staying at home these days? --He ___________ since a month ago.
The president of the country was ______well of when he was in power.
They suggested not only___________ to the party but also give a performance.