（1）What___you___when it began to rain?A are,doing B did,do C were,doing D were,do
（2）I was watching TV___the thief came into the house.
A when B while C for D because
（3）School closed___the day because of the death of Chairman Mao.
A to B for C on D off
（4）___maths is not easy,I want to study it well.
A Although B But C If D So
（5）He was___silence all the afternoon,because he had a sore throat.
A in B with C on D of