We began to open to the outside world in the late 1970s. ,there have been great changes in the country.
I could have turned to Mr. Smith for help, but he ______ too busy then.
The speaker is giving a rather _______ speech, as I can judge from the _______ look on the listeners.
He promised to do what he ______ sure of _______.
That was all ______ could do in such a poor financial situation.
I am tired. I ______ all day.