填空。用所给词的适当形式填空（共10小题，每小题1分）
小题1:I have received your _______________(invite). Thank you very much.  
小题2:We’re _________ (plan) to visit France this summer.
小题3:He gave a detailed __________________(describe) of the thief.
小题4:At first nobody noticed the child’s ________ (appear). A few minutes later, his mother shouted, “ Where’s my child?”
小题5:_______________ (true) black flowers do not actually exist.
小题6:I have trouble ________(work) out the maths problem
小题7:Mary showed her ________ (confident) when she went into the room. 
小题8:There was an accident last night. __________ (lucky), the young man was not badly hurt.
小题9:I’ll do whatever I can ____ (improve)my English.
小题10:A letter of __________ (apply) is very necessary when your are finding a job.