—Did you have any difficulty catching yesterday’s lecture?

—No. The professor spoke very clearly to make his speech easy _____.

A. understood         B. understanding           C. to be understood              D. to understand

—Did you have any difficulty catching yesterday’s lecture?

—No. The professor spoke very clearly to make his speech easy _____.

A. understood            B. understanding              C. to be understood                   D. to understand

--- Did you have any difficulty catching yesterday’s lecture?

--- No. The professor spoke very clearly to make his speech easy ______ .

1. A.
   understood
2. B.
   understand
3. C.
   understanding
4. D.
   to understand

—Did you have any difficulty catching yesterday’s lecture?
—No. The professor spoke very clearly to make his speech easy _____

1. A.
   understood
2. B.
   understanding
3. C.
   to be understood
4. D.
   to understand