选择题：a digital computer is a system composed of four distinct elements: a central processing unit, input

___________ need more focus on pronunciation because they are more likely to substitute english sounds with sounds from their native language.

grammar pratice is usually dividied into two categories:_________________.

there are many situations in which we use more than one language skill, so it is valuable to integrate the four skills to _________.

the ultimate goal of learning a foreign language in a grammar－translation classroom is to enable the students to _____ its literature.

the change from sentence to discourse is the change from learning language _________ to __________.