______ the project in time, the staff were working at weekends.

在探究“滑动摩擦力的大小与哪些因素有关”的实验中．

如图是“生物圈中碳﹣氧平衡”示意图，请分析回答：

     Two men are walking in the park. One is Mr Brown , a worker, the other is Mr Black. Mr Brown is going to a chair. It is by the road. Mr Black is after him. Mr Brown finds Mr Black. Now Mr Black begins to walk faster(更快). Because he wants to get to the chair before Mr Black. Now Mr Black begins to walk faster because he also wants to get to the chair first. Then they both run .Mr Black runs faster than (比) Mr Brown. So he gets to the chair first and sits down on it. Mr Brown runs after Mr Black. When he gets to the chair. He sees Mr Black sitting on it. He is sorry to show a notice(通知)with the words“Wet Paint(油漆未干)”to Mr Black . Now Mr Black knows why Mr Brown is going to the chair.

把下面的词语连成一个通顺的句子。

①远在国外的    我    一个   发了   给   贺卡   表姐   试着

②远古   植物   时代的   地层底下   煤炭   变成的   是由   埋在