In the time of HINI, scientists ____ their spare time to conduct research on the ways of curing the disease.
He was always _______ for knowledge, and at last became an expert in the field of art.
______ at the crossing and you will see a tall white building.
Rather than ______ at home playing cards on the Internet, I prefer _______ out for a day trip.
Two-thirds of the land ________ covered with green grass and the rest _______ covered with pine trees.
I feel it is you as well as your wife that for your son’s bad performance at school.