In each of the following sentences you are given two confusable words or expressions in brackets. Choose the appropriate one to fill in the blank. You may consult a dictionary if necessary.填写字母代码即可。 1) We will invite the parties ________(A. concerning B.concerned) to participate in the discussion. 2) _____(A. concerning B. concerned) your letter, I am pleased to inform you that you are to receive the order by the end of this week. 3) We’ll have to _________(A. reject B. decline) these products, because they have some little cracks in them. 4) We sent him an invitation to the party, but he ___ (A. rejected B.declined). 5) After she hit her head on the wall, she was ______ (A.subconscious B. unconscious) for several minutes. 6) She had a(n)____ (A. subconscious B. unconscious) fear whenever she saw a snake. 7) Bill and Jack are twins. The ______ (A. preceding B. former) is taller than the latter. 8) In the _________ (A. preceding B.former) chapter we discussed the civil rights movement in the US in the 1960’s. 9) Every morning we ______ (A. raise B. rise) our national flag at the school gate. 10) The plane was then able to ________ (A.raise B. rise) and it cleared the mountains by 400 feet.