—Is there anything wrong, Bob? You look sad.—Oh, nothing much. In fact , I ____ of my friends back home.
He dressed up and went to the party as if ________.
After completing and signing it, please return the form to us in the envelope _______.
The book was written in 1946, _______ the education system has witnessed great changes.
He ______ be sitting at the gate, waiting for his lost son.
It is often recommended that children _______ chances to get close to nature.