( a+b ) - ( a-b )

( xy+yz-x ) + ( x+xy-2yz )

( 2m+7n-9mn ) - ( 6mn + 15m - 27n - 21) 

Thanh is always ............ to turn off the lights before going to bed ( forget )

............... , we lost the gam. We feld very disappointed ( fortunate )

Thanh is always ............ to turn off the lights before going to bed ( forget )

............... , we lost the gam. We feld very disappointed ( fortunate )

After ............... the housework, I went to bed ( finish )

She finds it ............. to take pictures of flowers in the springs  ( interest )

After ............... the housework, I went to bed ( finish )

She finds it ............. to take pictures of flowers in the springs  ( interest )

Thanh is always ............ to turn off the lights before going to bed ( forget )

............... , we lost the gam. We feld very disappointed ( fortunate )