Only by practicing a lot _____ our English well enoughto communicate with foreigners

Mr Smith found thatgas from the pipe when he cameback because we forgot to switch off But at last we were lucky toescape

Did you catch the first bus this morning—No It had left the stop _________ I got there

How do you _____ we go to Xian, Yinchuan and Taiyuan for our holiday? — I really think that we travel by air, which is comfortable. [ ]

talk about it withme,please wait till I finish my work at hand