He decided to study hard_____________ catch up with others.

as much kinder to Jack than she was to the others, , of course, made all the others upset.

At 9: 00 am next Sunday, I _____ to Professor Willard talking about brain.

The flowers in the garden are different from _________ in vases.

The Great Western Development ___ a bridge between China and the rest world, promoting the common economic development and prosperity of China and the world at large.