It is the first time that the local education authority ________ such strict requirements on going-to-school time for primary and middle school students.
______ can do a job patiently and attentively for many years unless he loves it.
Environment protection requires our joint effort. ______ will be achieved unless we work well together.
---Can I join your club, dad? ---You can when you _______ a bit older.
Because the shop_______, all the T-shirts are sold at half price.
---Jack hurt his leg yesterday. ---Really?________?