In 1492 Columbus and his crew arrived ______ was so-called the New World by the westerners.
I found him _____ on his back _____ upward.
We didn’t know you were in trouble at that time, _____ we would have lent you the money.
I’ve finished much of the work. Could you please finish ______ in two days?
There was a terrible noise _____ the sudden burst of light.
Do you consider _____ any good doing many scientific experiments?