---Hi. Lucy! What’s wrong with you? You look so worried.---I have many problems to solve, but I don’t know ___________ first.
Hurry up,________ you’ll be late. A.and B.so C.or
He wants to join the ________ club.He can ________ chess.
I can ________ Chinese kung fu.
Do you have a pen?I want to ________ a letter.
Ann often helps me ________ math after school.