单选题 If the pain ______, I suggest you go to the hospital immediately to consult the doctor.

单选题 When checking in for a flight, passengers have to pay ______ fees for their excess baggage.

单选题 The CEO ______ the collapse of the corporation by his incompetent leadership and reckless spending.

单选题 Medical scientists claim that the advantages of the new drug ______ the risks it brings.

单选题 It is ______ to start considering job applications at the beginning of your fourth year in college.

单选题 Mary has been ______ a grudge against her manager ever since her promotion was refused.

单选题 The government will ______ an extra tax on tobacco next month in an effort to discourage people from buying it.

单选题 Due to global warming and deforestation, more and more species are ______ to die out.