Although he knew little about the large amount of work done in the field , he succeeded other more well-informed experimenters failed.
.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.