Đáp án : 4, Hardly had the paint in the sitting room wall dried when my daughter put her dirty hands all over it.
5, Before going to university, he went to military service.
6, My classmates and I haven't visited our teacher since we started our first job.
7,Once your son knows how to swim, he will never forget it.
8, You won't be allowed o go home until you finish your work.
9, After having been independent for 24 years, Ceylon changed its name to Sri Lanka.
10, No sooner had he gone out of the bank than one of the robbers attacked him.
11, By the time the children reach home, their father will have returned from work.
12, By the time the firemen arrived on the scene, the fire had destroyed the whole building.
13, Scarely did Maggie finish speaking when members of audience started to crictise her
14, While I was chatting to Jane, the line went dead.
15, When did you learn English?
