bought three DVD copies of the film Avatar and now _ is left. Somebody just borrows something and never returns.
Scientists ______ thousands of chemicals before they decided on the right one in the end.
To some extent, uncontrolled information from the website that many people turn _______ false.
People who tend to focus on ______ while speaking a foreign language may find that they worry too much about making mistakes.
Life is like _________ ocean; only ________ strong-willed can reach the other shore.
________ is known to citizens in Changchun, the news ________ the students from Jilin Provincial Experimental School did a fantastic job in the 2014 College Entrance Examination spread in the whole city.