1.Do you know who have given out the leaflets at the shcool gate yesterday?
2.Do you know who gave out the leaflets at the school gate yesterday?
3.They set a calling live program centre for the parents.
4.I can't solve the problem.
5.I put enough flowers into the basket.
6.His heart is full of joy at once.
7.Being both deaf and blind can't be imagined by the most people .