Ⅰ.用所给单词或短语的适当形式填空
she, encourage, regret, find out, join in
1．We ____________ planting trees last weekend.
2．Have you ____________ why he was late?
3．The girl enjoyed ____________ playing in the water.
4． Our head teacher always ______________ us to solve problems by ourselves.
5．When I knew what had happened, I ____________ telling him the truth(真相)．
