______ it have been the failure to pick up directions from the ground control that caused the air crash?
| A．Must | B．Could | C．Would | D．Should |
—What should we pay more attention to if we go out for a mountain camp.
—Nothing special. Take a special pair of glasses ______the wind there is strong and cold.
| A．now that | B．in case | C．providing that | D．so long as |
I didn’t understand ________led him to be late for three times every week.
| A．what it was that | B．it was where that |
| C．how it was that | D．why was it |
_______ made me angry was that it never______ her that her parents might be worried.
| A．That; happened to | B．What; occurred to |
| C．What; belonged to | D．That; meant to |
Some refugees made______ new life for themselves across the border, but they were troubled with homesickness in _____later life.
| A．a; 不填 | B．the; the | C．a; the | D．不填; 不填 |
— How did they _______ your suggestion?
— Opinions vary.
.
| A．reply | B．reacted to | C．object to | D．think |