127. The South African student always keeps in touch with his family by e-mail and never _____ to write to his mother.

It’s been such a wonderful evening with you! Thank you very much!—_______

With the development of science and technology , more new technology____ to the fields of IT

19．We’d better set off now, or it will be dark__________we know it

_____is no need for me to say anything about his action_____it speaks for itself