271. Wait for me for a few more minutes. I am _____ to a letter from one of my former classmates at college and will finish writing very soon.
Seeing that the drowning child was struggling in the icy water, the soldier dived into the river without hesitation, ___ his own safety.
If you just spend your time___ gains and losses, maybe you'll get nothing in the end.
According to the newly-made traffic regulation, whoever drives through red lightbe fined at least 200 dollars.
He is very popular among his students as he always tries to make them ____ in his lectures.
I'm afraid I'm not ___ to help with the show, for I am fully occupied with my own project