根据首字母或汉语提示，完成下列单词的拼写，使句意明确、语言通顺。
1. This morning I sent them some flowers as an
expression
of thanks.
2. You should pay
attention
to your speaking speed.
3. Can you
repeat
what you said just now? I didn't hear you clearly.
4. Pronunciation, spelling and
grammar
are important for English study.
5. Among all the subjects, she likes
physics
and chemistry best.
6. Students should
review
(复习) what they have learned after class.
7.
Knowledge
(知识) comes from questioning. So we should learn to ask questions if we want to learn more.
8. For me, listening to English songs is the
secret
(秘密) to learn English words.
