单项选择题I took my condenser to a shed in the fields ______ I could do my experiment.
单项选择题He had lost his temper and his health in the war and never found ______ of them again.
单项选择题______ from the top of the tower, the south foot of the mountain is a sea of trees.
单项选择题—When can we discuss the problem — ______ when we can, we must prepare for it right now.
单项选择题—Did you get a job —No, I ______ , but it's no use.