1 Look! The boys… the tree.

a) climb

b) are climbing

c) climbed

2 Every Saturday I…to the swimming pool.

a) go

b) goes

c) am going

3 Mary … a very nice hat last Monday.

a) is buying

b) buy

c) bought

4 Where … you go yesterday?

a) did

b) does

c) do

1-(b)
2-(a)
3-(c)
4-(a)

Look! The boys are climbing the tree. (b)Every Saturday I go to the swimming pool.  (a)Mary bought a very nice hat last Monday.  (c)Where did you go yesterday?  (a)