--- You promised to call me last night. --- I called, but I just couldn’t _______.
It is dangerous to play with the knife. You ______ hurt yourself.
I bought three DVD copies of the film Avatar and now _ is left. Somebody just borrows something and never returns.
This new computer is obviously superior ______ the old one because it has many new functions.
______ strong-minded the teachers are, they should give their students enough time to share their ideas in class.
Ted and his friends established a website offering useful information about thunderstorms ______ similar accidents happening.