Why Tom,your skirt is so dirty!—Mum, I my storeroom downstairs.

下列表述不正确的一项是

_____ to make a breakthrough in his career, he worked day and night in the company [ ]

It is uncertain _______ side effect the medicine will bring about,although about two thousand patients have taken it.

Would you mind looking after my dog while I’m onholiday– _______.