He didn’t____ what I said because his mind was on something else.
Stephen Hawking believes that the earth is unlikely to be the only planet _life has developed gradually.
---- An ant has two stomachs --- one for itself and the other for others. ----Really? Quite interesting. I ________ anything about it.
Scientists say it may be one year or so ________ it is possible to test the new medicine on human patients.
It is reported that 70% of people in China are ________ about the food security situation after so many accidents.
You have made a few mistakes in your composition but _______ you have done well.