完成句子（每小题2分，共10分）
今天下午我们将一起去北京。
We’ll go to Beijing _______ ________ this afternoon.
开始他们有点儿紧张。
_______ ________ they were a little nervous.
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.
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.
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.