Choose the best one from the items given below to complete the following passage. Early computers { 1 } to solve mathematical and engineering problems. The first general purpose of { 2 } electronic computer was the Electronic Numerical Integrator and Computer (ENIAC), built by J. Presper Eckert and John V. Mauchly at the University of Pennsylvania in 1946. It filled a thirty by fifty-foot room and { 3 } thirty tons. The computer had 18,000 vacuum tubes which { 4 } perform calculations at a rate of 5,000 additions per second. This is { 5 }than any human could perform, but a great deal slower than the computers of today. 1:A. are build B. were built C. build D. built 2:A. programming B. programmatic C. programmable D. program 3:A. weighed B. weighted C. weigh D. weight 4:A. are used to B. used to C. use to D. were used to 5:A. more fast B. faster C. much faster D. very faster