1. when a giraffe has ______ drink, it has to stand with its front legs wide apart in order to reach ______ water easily.
a. 不填；不填 b. a; the c. the; 不填 d. 不填；the
2. _______ has recently been done to provide more buses for the people, a shortage of public vehicles remains a serious problem.
a. what b. though what c. in spite of what d. however what
3. if you can make what the teachers teach ________, you’ll make rapid progress.
a. yours b. yourself c. you d. your
4. ______ only 20 minutes to go before the train left, i felt uneasy in the taxi to the railway station.
a. for b. with c. as d. because
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