You were brave enough to argue with Mr. Smith. —Well, now I regret _______ that.

The part he ______ in the film was popular with the audience.

Lao She’s Teahouse ________ the changes in Chinese society over fifty years．

English is interesting, _______ I didn’tlike it at first.

Mary has been trained hard for the last two years —______ she did so well at the track and field meet yesterday