On the third floor there are two rooms, _____ is used as a meeting-room.
.He pretended _______ nothing about it.
. Little Jim should love _______ to the theatre this evening.
. They would not allow him _______ across the enemy line.
. There are so many kinds of tape-recorders on sale that I can’t make up my mind ____to buy.
. Charles Babbage is generally considered _______ the first computer.