To gain a bigger _______ internationally, many companies are striving to make their products more competitive.
The roof fell ______ the PLA men had time to rescue the child trapped in the house.
When he ______ the front door, he found his keys were nowhere.
The university with two____ campuses has a student population of 50,000 in total.
Faced with_______ failure, it is the most important for us to keep up ______good state of mind.
All the tourists _______ about the bad service in that restaurant.