pains-taking efforts, he eventually concluded that the principle he stuck _______ true.

you got any plan for the coming summer holidays—Well，I’m going to a quietplace, especially _____ suitable for relaxing myself.

(2013·江苏南京二模)Provide your doctor with a detailed medical history ________ he can give you accurate treatment

Mr Smith never means what he says．I dislike him． — ______________, as the saying goes．

Scientists are trying their best to_______ ways to treat the terrible disease caused by Ebola(埃博拉）．