1.studied with a group just now.(用Just改为现在完成时)

1.studied with a group just now.(用Just改为现在完成时)
I＿just＿with a group.
2.All of the boys have tried twice.(否定句)
＿of the boys ＿tried twice.
3.China has changed a lot in the past 20 years.(同义句)
There have been a lot of ＿in the ＿20 years in China.
4.She couldn't stop laughing when she heard the good news.(同义句)
She couldn't ＿＿when she heard the good news.
5.It takes me ten minutes to walk to school.(同义句)
It's ten ＿ ＿for me to get to school.
6.Oh,dear.I feel something ＿ on my back.Please give me a hand.
A.climbs B.to climb C.climbing D.climb
7.He is ＿boy that everyone likes him.
A.so a clever B.such a clever C.a so clever D.such clever a