射击残留物的组成与分布形态是什么？

用方框内所给单词的适当形式填空，每词限用一次。

success  difficult   convenient  stand   nine

小题1:Mr. Black lives in the centre of the city, it’s very _____.
小题2:Mary likes to walk to the _____floor every day. It’s good for her health.
小题3:Only practice can make you a ______ person
小题4:Some students don’t know how to face the heated competition. We have to beat the________.
小题5:When I looked up, I saw my best friends and teammates______ there and cheering for me, with their eyes filled with care and encouragement.