If there is any assistance needed

If there are any questions regarding the services offered at Sweet Shop Bingo, the customer suppo...

In a self-spoofing video he made, Mr. Clinton holds forth in the White House briefing room and as...

If you have any questions, please don't hesitate to call me. 如果你有問題，請不要猶豫打電話給我。 那，究竟要用哪個呢？

4 and 1 are the correct ones in terms of grammar. 4 is the most natural one and it's what you'd u...