Once a difficult and even dangerous place , Vietnam is now a friendly detestation that welcomes visitors from all over the world .
A．considered; visiting B．considered; to visit
C．considering; visiting D．considering; to visit
There are no easy answers to questions brought to us by the rapidly changing world, we can try to turn challenges into opportunities．
A．so B．but C．for D．then
If they what I was saying, they'd know what I was talking about
A．took the trouble to listen to B．had trouble listening to
C．take the trouble to listen to D．have trouble listening to
"I wish you’d look at me when I'm trying to speak to you!" the teacher said .
A．excitedly B．pleasantly C．hopefully D．angrily
Mr．Smith gave the attendants a wonder lecture the company in the international conference.
A．on behalf'of B．owing to
C．in the place of D．standing for
Please don't call me at the office it's really necessary．
A．if B．unless C．otherwise D．except
