1)They ... their homework before they ... out to play yesterday

1)They ... their homework before they ... out to play yesterday afternoon.
a)have done/went
b)do/go
c)did/went
d)had done\went
2)An invitation ... to Mr.Brown last week.
a)was send
b)was sent
c)sended
d)sent
3)I don't like those chairs.They're really ... .
a)discomfortable
b)uncomforting
c)uncomfortable
d)incomfortable
4)The floor ... yet.
a)hasn't been cleaned
b)wasn't cleaned
c)isn't cleaned
d)hasn't cleaned
5)They said they ... a dog for a walk that evening.
a)take
b)are taking
c)were taking
d)will take
6)It's better to set ... before it gets dark.
a)off
b)up
c)in
d)aside