The scientist did ＿＿ experiments to test the new drug.

      A. a series of    B. a good many of    C. a great many   D. a lots of

The scientist did ＿＿ experiments to test the new drug.

      A. a series of    B. a good many of    C. a great many   D. a lots of

The scientist did ＿＿ experiments to test the new drug.

1. A.
   a series of
2. B.
   a good many of
3. C.
   a great many
4. D.
   a lots of

The scientist did ＿＿ experiments to test the new drug.