.These are all ________houses for the homeless.
—We are planning to have a casual get-together this Saturday or Sunday. Are you coming?— ________. I’ve got rather a full day this weekend.
At the sight of the policeman _____from behind the door.
---Is there anything else I can do for you, Jack? --- No, thanks. I really appreciate ______ when you lent all your notes to me before the exam.
It is uncertain ______ side effects these weight-loss drugs will bring about, although hundreds of thousands of patients have taken it.
– Which color do you prefer, red or black? -- Red. For red _____ a sense of energy and strength.