He speaks English well indeed, but of course not ________ as a native speaker.

Most Australians actually don’t seem to do much sport. _____, Australia is generally considered to be a great sporting nation. 

. --- This book by Tony Garrison is of great use for our course. --- But I think his latest one is______ worth reading.

As technology continues to advance，we must learn and adapt        or we'll risk becoming a dinosaur.

.．As is often pointed out, knowledge is a two-edged weapon which can be used_____________for good or evil.