Sentence Reconstruction 重组

Sentence Reconstruction 重组
1.Combine the following two sentences into a complex sentence using the dependent clause connector "while"
The students were taking the test.The teacher was writing a book on his notebook computer.
2.Combine the sentences into a cmpound-complex sentence using the coordinating conjunction "but" and the dependent clause connector "until"
Students will not be allowed to leave.All test-takers have completes the exam.They may take a short break after the first two hours of testing.
3.Combine the following two sentences into a complex sentence using the dependent clause connector "now that"
Karen has graduated from college.She can apply for an executive jor at her friend's company.