In informal speech, people often omit sentence subjects because they are commonly understood. What are the omitted subjects in the following two sentences？ Why do people know that these are the correct subjects？ a. Hope you like everything here. b. Just imagine what has just happened here.

The utterance meaning of the sentence varies with the context in which it is uttered.

此题为判断题（对，错)。

During language acquisition, children go through several stages, during which stage they begin to have sensitivity to the phonetic distinctions used in their parents language.
A．Holophrastic stage
B．Two word stage
C．Three word stage
D．Fluent grammatical conversation stage

How does the top-down approach differ from the bottom-up approach in language processing？
A．Bottom-up processing is more effective than top-down processing in speech synthesis.
B．Bottom-up processing utilizes all information one has in speech perception.
C．Top-down processing uses one" s existing knowledge and the incoming speech signal.
D．Top-down processing is more efficient than bottom-up processing in speech comprehension.

Research has found that two-year-old English children produce negative sentences such as a) to d) , but not e) : a) He doesnt like cabbage. b) Doesnt like cabbage. c) Him no like cabbage. d) No like cabbage. e) * Him doesnt like cabbage. How can you account for this？

______are language varieties appropriate for use in particular speech situations.
A．Slang
B．Address terms
C．Registers
D．Education varieties