MUM IS ALWAYS BUSY _____ HER WORK IN THE LABORATORY.A. WITH B. AT...

15. - PREPOSITIONS LI THUYET BAI TAP DAP AN
PREPOSITIONS LI THUYET BAI TAP DAP AN
15. Mum is always busy _____ her work in the laboratory.A. with B. at C. in D. of16 Lan will stay there _____ the beginning in September _____ November.A. from/ to B. till/ to C. from/ in D. till/ of