The researchers found clear and convincing evidence ________ happiness is the key when it comes to better health and longer lives.
| A．where | B．whether | C．how | D．that |
Life is the most important in the world so we should never compromise _____ safety standards．
| A．with | B．between | C．on | D．in |
Generally speaking, when _____ according to the directions, the medicine had no side effect．
| A．take | B．taken | C．to take | D．to be taken |
________ it is expected that students come to college with the ability to solve most problems in their study by themselves , this is not always the case.
| A．When | B．While | C．For | D．As |
--- Wow, you look good. Your hair looks fantastic. You’re so giving and kind. I’ve always liked you.
--- _______! Get to the point. I haven’t got all day.
| A．Enough | B．Thanks | C．Really | D．Again |
--- What was the Shanghai World Expo’s opening day like?
--- Wonderful. It’s years ______ I enjoyed myself so much.
| A．that | B．since | C．before | D．when |