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I have been studying ___ half an hour.
a. until
b. since
c. for

In most developed countries,it is not necessary for people to boil water before they drink it.

A. In most developed countries,people ought to boil water before they drink it.

B. In most developed countries,people must boil water before they drink it.

C. In most developed countries,people needn’t boil water before they drink it.

D. In most developed countries,people mustn’t boil water before they drink it.

we use ___ when it is clear who or what we are talking about

A. a/an

B. the

“Can I borrow your pencil for a moment?”

1. She asked me whether she can borrow my pencil for a moment.
2. She asked me whether she could borrow my pencil for a moment.
3. She asked me if she can borrow my pencil for a moment.