.We cannot figure out ____quite a number of insects, birds, and animals are dying out.
A.that | B.as | C.why | D.when |
Mr. Green showed his students some photos ________ at World Expo 2010 Shanghai.
A.being taken | B.taken | C.to be taken | D.having taken |
A group of children are looking into the box, ____ about what can be inside.
A.curious | B.worried | C.careful | D.sorry |
I must be off now. My friends ________ outside.
A.wait | B.have waited | C.are waiting | D.were waiting |
David is a great teammate. He knows well how to work with __________.
A.both | B.other | C.another | D.others |
I was about to walk over to Tom’s seat when he ____ and left.
A.got up | B.tuned up | C.kept up | D.came up |