He is not selfish at all; instead he is always _________ to help others in trouble.

Lydia doesn’t feel like __________ in the north as she is a little bit homesick.

I am sure that if it came to that point, he would do___ is expected of him.

Not until____ did Humphrey begin working.

Several teachers and students are working together to find ______ they hope will be the easiest way to solve this problem.

Evidence has been piled up ______ drinking water after getting up in the morning contributes to one’s health.

---I had practiced my spoken English, but still failed in the oral test.
---Don’t be discouraged. _____ and you will surely pass it.

To his disappointment, not a single gift _____ on his birthday.

That hazy（雾霾）weather has hit 104 cities in middle-east China lately makes citizens well aware of
______a terrible problem China is faced with.

His mind went so blank that little________ down for the first ten minutes in the test.