______you are always optimistic and self-confident, I can't wait to make friends with you.
| A．Though | B．Since | C．While | D．So |
The conference has been held to discuss the effects of tourism ______ the wildlife in the area.
| A．to | B．on | C．at | D．with |
I’ve already told you that I’m going to buy it, ________.
| A．how much does it cost | B．no matter how it costs |
| C．however does it cost much | D．however much it costs |
As high school students, it’s very important to keep ourselves ______ of what’s happening home and abroad every day.
| A．to inform | B．informing | C．informed | D．be informed |
In order to protect the environment, supermarkets and stores are forbidden to ______ free plastic bags to shoppers..
A. put away B put off C. give off D. give away
Believing that everyone can make _____ world _____ better place on a daily basis, Tom plays his part in helping others.
| A．/, a | B．the, / | C．the, a | D．the, the |