–I tried many times, but I still failed in the experiment. --Don’t be discouraged. _______ and the problem will be settled.
As we all know, it was _____ that resulted in the terrible car accident.
In order not to be disturbed ,I spent three days __________ in my study.
With online course Crazy English has over 20 million students all over China _______ the class through the Internet .
He sat back on the chair, took a book and began to read, ___.
At the computer operation test, one is supposed to stay at his own machine, keep his eyes on his screen, ______ to anyone.