The researchon the new flu virus vaccine is challenging and demanding Who do you think cando the job —______ mystudents have a try

"I wish you’d look at me when I’m trying to speakto you!" the teacher said

Does Bill do his new job well— ________ his old job I’m afraid there’sno hope for him

You have done so much work—you ______ pass the exam.

We’d better hurry up. The exhibition hallis a bit far from ______ we are now.