--- What’s up with Maria? She looks upset.-- A call from her mother ________ the attack of homesickness.
It was so noisy that we hear ourselves speak. A. couldn’t B. shouldn’t C. mustn’t D needn’t
Have you ever heard of the trees that are homes animals both on land and sea?
Tom had to______ the invitation to the party last weekend because he was too busy.
Despite the previous rounds of talks, no agreement______ so far by the two sides.
I ______ have worried before I came to the new school, for my classmates here are very friendly to me.