B1. A group __boys and girls are dancing in the park.
A.with B.ofC.forD.toA2. A lot of students in our school were born __March,1981
A.in
B.at C.onD.sinceA 3.Tony suddenly returned __a rainy night.
A.on
B.at C.in
D.duringA4.My grandfather was born __Oct.10,1935.
A.on
B....
