1. he seldom stay up late at night, ________ necessary, to keep himself full of energy the next day.
a. if b. unless c. until d. while
2. trees planted along roads add a touch of nature to our surroundings, which otherwise _____ unattractive.[来源:学科网]
a. would look b. will look c. look d. looked
3. excuse me, i ______ i was blocking your way.
a. didn’t realize b. don’t realize
c. haven’t realized d. wasn’t realizing
4. i wonder why ann didn’t get _______ the job. she is the right person for it.
