This is the reason ______he explained at the meeting for his carelessness in his work.
| A．that | B．what | C．how | D．why |
Einstein’s Theory of Relativity was so __________that few people could understand it at that time.
| A．controversial | B．religious | C．abstract | D．contradictory |
Since entry into high school the students have been ________ staying up late in the evening and getting up early in the morning.
| A．admitted to | B．allergic to | C．accustomed to | D．attached to |
—Was it under the tree _______ you were away talking to a friend?
—Sure. But when I got back there, the bike was gone.
| A．that | B．where | C．which | D．while |
Two explosions near the finish line of the Boston Marathon killed at least 3 people and injured more than 180 others, and currently FBI has figured out how it __________.
| A．came up | B．came out | C．came across | D．came about |
A person ________ with H7N9 viruses will be more likely to die of lung dysfunction.
| A．developed | B．infected | C．injected | D．progressed |