Question

4. Progress so far has been very good.          (所以) ，we are sure that the project will be completed on time.

Answer 1

4. Therefore "一直进展良好"与"按时完工"是因果关系，故用 therefore 。句意：到目前为止，工程进展得很顺利，所以我们相信这项工程一定能按时完成。