The invention of the chip greatly _______ the development of computer science; ______ the computer science stepped on the freeway of rapid development.
Some people find the film Avatar difficult______.
This maths problem isthat one.
. Who could have ____ that within 10 years he’d be in charge of the whole company?
This young tree could not have been damaged ______accident; I believe it was done _____ purpose.
All the students ______come from America are here.