The construction of the two new railway lines ________ by now.
“Sorry” is the hardest word to say sometimes. _______ you know you’ve done something wrong, or something inappropriate, it takes courage to say sorry.
--- How are you, Jack?---_________, I’m rather sick.
The majority of rural migrants are engaged in the most painstaking, most tiring and dangerous work, _______ college graduates are reluctant to do.
The key to ___ new ideas is to observe daily life carefully, and not to take things for granted.
After walking in the Shanghai World Expo for a whole day, my legs ____ under me and I couldn’t walk any farther.