Mum, I was wondering if you could lend me a few dollars until Ion Friday

We offered him our congratulations ___ his passing the college entrance exams

It still puzzles today’s scientists_____ some mammals produce their young _____others lay eggs to producetheir offspring (后代)[ ]

do you spell ruler—-R—U—L—E—R, ruler.

He says __________________ to his parents before he goes to bed.