He will spend six hours at his desk _______ he finishes his composition

Whenhewasold,MrSmith_____sitforhourswithoutsayinganything.

Whoever has ____ sense knows that smoking is harmful to people’s health. [ ]

If you go to Beijing, don’t forget to buy some Qingfeng Baozi for me. – . I also want to try the famous baozi.

There is an old bridge ____ theriver.