完成句子（每小题2分，共10分）

1.今天下午我们将一起去北京。

We’ll go to Beijing _______ ________ this afternoon.

2.开始他们有点儿紧张。

_______ ________ they were a little nervous.

3.王老师说他会帮助我们克服数学难题。

Mr Wang said he would _______ us________ with maths problems.

4.那个外国朋友给了他许多礼物，比如：钢笔、小刀、帽子等。

The foreign friend gave him lots of presents, _____ _____ a pen, a knife, a hat on so on.

5.李华一回到教室就看见了他的书包在地上放着。

Li Hua found his bag lying on the floor ____ ______as he came back to the classroom.