1–_______ do you like this book? –Ilike it because it can remind me _______ my childhood.

To improve the quality of our products, we asked for suggestions _____ had used the products.

itated for a moment beforekicking the ball, otherwise he ____a goal.

Mary is the only one of the students in our class who ____ to the Great Wall so far

The historic step the leaders of the two counties took was ________ by the whole world, wishing them positive results for their meeting.