Due to the widespread ____________ of this medical technology,more diseases can be discovered and treated at an early stage.
49. I don’t know whether small oranges are sweeter than big ______.
50. When they met, they stopped and said hello to_______.
51. After everyone took_______ place, the meeting began.
52. -Why don’t we take a little break? -Didn’t we just have _______?
53. If you want to change for a double room you’ll have to pay ___$15.