_______the activities might seem childish, in reality they require a lot of strength and determination.
| A．When | B．As | C．While | D．Once |
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 |
—Dad, dad! My head hurts so much. I think I’m dying.
—________, darling! The doctor says you will feel better soon.
| A．That will do | B．There, there | C．Hi, there | D．So long |
Comparison may make something appear more beautiful than it is when ______ alone.
| A．to see | B．seeing | C．is seen | D．seen |
Jessica has always been honest and straightforward, and it doesn’t matter ________ that she’s talking to.
| A．who is it | B．who it is | C．it is who | D．it is whom |
According to the original design, the plant would be able to _______ at least 8,000 pianos a year.
| A．bring out | B．take out | C．put out | D．work out |