Use the correct-form.
1) He .... his workyeterday evening
a) does b) is doing c) did
2) They usually .... to the seaside in summer.
a) go b) is going c) went
3) The childeren ..... the excursion lasy Sunday.
a) enjoy b) enjoys c) enjoyed
4) Look! The childeren.....in the like.
a) swim b) are swimming c) swam