we met with difficulties, they came to help us.[ ]

I’m not allowed to go out on school nights. — .

Let’s go to Hainan on vacation. -Oh, no. I have to Hainan several times.

Jack, could you help me ________ these pictures on the blackboard? It may help us know more about the hazy weather. (雾霾) — With pleasure.

China __________ the WTO and became a new member of it.