I have no idea ＿＿＿ David is in trouble, he will turn to you for help

Miss White, could you please speak _________ We can’t hear you.

What does the model plane look like?—Well, the length of its wings is _______ of its body.

You’ve failed to do what you ______ to and I’m afraidthe teacher will blame you

Three days later, word came _______ our country had sent up another man-made satellite.