A. for a time B. grandparent C. necessary D. at the top of A. failure B. yoyo C. left D. near A. parent B. environmental C. astronaut D. lecture A. sent B. e-friend C. protect D. first A. distribute B. grandmother C. sadly D. production A. cheap B. for sale C. yes D. forest A. everyone B. interviewer C. Venus D. print A. emit B. attack C. impatiently D. how A. be tired of B. maths C. cut D. crust A. skill B. school C. thirty D. convert