It’s vital that enough money_____collected to get the project started.

（ ） the past year as an exchange student in Hong Kong, Linda appears more mature than those of her age.

I won’t call you, （ ） something unexpected happens.

（ ） he often forgot their wedding anniversary greatly annoyed his wife.

He studies so hard to avoid （ ） at the bottom of the class.

Only when （ ） in the afternoon （ ） able to leave.

My children are looking forward to （ ） a trip to Paris.

As population increases, （ ）.

When I saw the expression on his face, I realized he is （ ） agreement with me.

（ ） five hundred people are believed to have drowned.

Mary likes classical music _____ her brother likes pop music.

Space vehicles were launched into outer space_____search of another living planet.