There must have been a large number of tourists in Sanya during the past Spring Festival, ________?[ ]

Everything from greeting to eating can be an opportunity to do the wrong thing which not only embarrasses yourself, but ____ your host. [ ]

I had time to check what I had written in the exam, the bell rang.

We have worked so long. Shall we stop ______ a rest

—Did you find the missing couple in the mountain yesterday?—No,but we _____ to get in touch with them ever since.[ ]