—You may find the key to the math problem on page 107.—Ah, it’s so simple. I wonder why I _____ of that.
Hearing his friend calling him , out __________ .
Whatever happens, you may depend on ________ that I will be with you.
__________ in the new on-line game , he missed the final boarding call of his flight .
It sounds like something is wrong with the car’s tyre. , we’d better take it to the garage immediately.
The abrupt change of the climate has drawn __________ worldwide attention to __________ benefit of green energy .