I ________ my key. Can you help me look for it?
A. Lose
B. Have lost
C. Had lost
D. Am losing
Chọn đáp án B
Alan took a photograph of Sandra while she________
D. Hadn’t looked
On July 20, 1969, Neil Armstrong ________ down onto the moon, the first person ever set foot on another planet.
In the last two decades, space exploration___great contributions to weather forecasting.
C. Made
If coastal erosion continues to take place at the present rate, in another fifty years this beach________ any more.
The phone________ constantly since Jack won the first prize this morning.