---You aren’t looking well. Anything the matter?---I’ve been surfing the net too long. I’m a bit tired.I can hold on,____.
As a writer, he used to go deep into life to __________ materials for his creation.
You should take advantage __________ this opportunity and try to make a good impression __________ them.
There was a (an) __________ silence between us after we were left alone in the sitting-room.
You will succeed in the end __________ you give up halfway.
__________ to his scientific work, he has no time to care for his family affairs, which his wife always complains about.