Finally we decided to fly to France for the winter holiday on our first stop，we planned to stay for three days．

They had no sooner arrived at the airport ________ it was time to check in.[ ]

We _____ more than 1,600 words since we began to learn English.

下列各组词语中，没有错别字的一项是

The Mekong River Commission has found no evidence thedams on the upper reaches have an influence on the water flow downstream