The conference has been held to discuss the effects of tourism ______ the wildlife in the area.
A. to B. on C. at D. with
I’ve already told you that I’m going to buy it, ________.
A. how much does it cost B. no matter how it costs
C. however does it cost much D. however much it costs
As high school students, it’s very important to keep ourselves ______ of what’s happening home and abroad every day.
A．to inform B．informing C．informed D．be informed
In order to protect the environment, supermarkets and stores are forbidden to ______ free plastic bags to shoppers..
A. put away B put off C. give off D. give away
Believing that everyone can make _____ world _____ better place on a daily basis, Tom plays his part in helping others.
A. /, a B. the, / C. the, a D. the, the
根据提示，完成下列句子。（每空填一个单词，每题1分，共5分）
1．我们应该保护河流不受污染。
We should ____________ the rivers ____________ ___________ _____________ .
2．他死之前为科学作出了巨大的贡献。
He ___________ a great ______________ ___________ science before he died .
3．他下决心在周五前完成这项工作。
He ____________ ______________ ___________ get the work done before Friday .
4．如果没有人叫你的名字我也认不出你。
I ________ ______ _________you, either,if someone hadn’t called you by name.
5．UN代表着联合国。 UN ______________ ______________ the United Nations.
