Researchers have found clear and convincing evidence ________ happiness is
the key to better health and longer lives.
| A．where | B．whether | C．how | D．that |
Mr. Black, ＿＿＿＿＿ born in Kentucky, lived and practiced law in Missouri.
| A．was | B．he was | C．although | D．who he was |
—— Have you watered the flowers?
—— No, but ＿＿＿＿＿.
| A．I am | B．I’m going | C．I’m just going to | D．I will go |
All substances, ＿＿＿＿＿ solids, liquids, or gases, are made up of entirely atoms.
| A．whether they | B．whether | C．whether are they | D．whether are |
—— How about the number of students playing on the playground?
—— ＿＿＿＿＿.
| A．Small | B．Many | C．Little | D．Most |
—— He promised to come to see you.
—— But he ＿＿＿＿＿. I’ve been all alone.
| A．didn’t | B．wouldn’t | C．hasn’t | D．won’t |