He was so __________ a key university thathe would work until late into the night.

Do you have any plans for this weekend— I’m not sure. I _____ go climbing Mount Baoshi.

There is ____”U” and _____”S” in the word “use”.

The pretty girl is always busy helping hermother with the housework _________ I go to visit her family.

When we came to the gate, he stopped _______ mego in first.