MUM IS ALWAYS BUSY _____ HER WORK IN THE LABORATORY.A. WITH B. AT...
15. Mum is always busy _____ her work in the laboratory.
A. with
B. at
C. in
D. of
16 Lan will stay there _____ the beginning in September _____ November.
A. from/ to
B. till/ to
C. from/ in
D. till/ of