At the 60th anniversary, the guests sitting in the front are those ______ graduates from the university.

（ ） when she started complaining.

Since Dick was busy, he rarely had time to go to the cinema; _____.

She didn’t want to go to Africa: probably （ ） the weather is too hot.

I certainly didn’t appreciate （ ） when I made mistakes.

Do you mean this is the_____decision you have made after thinking for hours?

Kim went to visit the teachers in the primary school ______ he worked three years ago.

______ , Martin can reach the branch of that tall tree at the gate.

Scientists say it may be five or six years （ ） this medicine is tested on human beings.

—Where are the children? The dinner’s going to be completely ruined. —I wish they （ ） always late.

When I got my first job, I _____ early. But nowadays I usually stay in bed until late morning.

It is important that the boy （ ） an adult to take care of him.