读一读，按要求完成任务．
（一）找规律，写出合适的单词．

my	mine mine
his his	his
your	yours yours
her her	hers
clean	cleaned cleaned
watch watch	watched
read	read read
sleep sleep	slept
one	first first
two two	second
four	fourth fourth
six six	sixth
cook	cooks cooks
go go	goes
study	studies studies
make make	makes

（二）参考以上内容，用所给单词的适当形式将句子补充完整．
（1）Excuse me ，is this book

yours

yours

（your）？Yes，it is

mine

mine

（ my）．Thank you．
（2）I

cleaned

cleaned

（clean） my room and

read

read

（read） some books yesterday．
（3）Where is the teacher's office？It is on the

first

first

（one） floor．
（4）Bill often

goes

goes

（ go） to school on foot．