请根据句意， 用动词的适当时态填空。A snowstorm ________________（hit） Beijing last Sunday.
I have to go now. Someone ___________（wait） for me at the school gate.
Can you see the butterflies ____________(fly) among flowers.
We ‘d better ___________(built) ourselves tents by the river first.
When wind and rain come, don’t forget _________ (close)all the doors and windows.