_______ hard-working boys! They have already worked for 3 hours without rest.
The villagers used to______ drinking water from the river nearby, but now they spend two hours _______ to get it in the mountain because of the dry weather in Yunnan.
––Have you returned the book to the library _______? ––Yes, I have _________ returned it.
What were you asked _______ at yesterday’s meeting?
–– How do you like the film AVATAR?–– Great! I _______ such a wonderful film before.
–– ________ I come back before 6 o’clock?–– No, you _______ . But you ______ be back later than 7 o’clock.