13. The teacher spoke slowly _____ all students could follow the lecture. (A) despite (B) so that (C) unless (D) whereas

16. The rapidly expansion of online retail platforms, accompanied by significant advances in digital payment technologies, has enabled consumers to compare products more efficiently and access a wider range of services than was previously available through conventional retail channels . (A)The rapidly expansion(B)has enabled(C)previously available(D)conventional retail channels