—What do you think of the hotel?—There are no customers in the hotel. It ______ have the friendliest service.

— Professor Smith, some students want to have a talk with you. ___ they wait here or outside?— Show them in now, please.

--- Will the new iphone cost a lot?--- I ________ think so. Apple’s products are usually expensive.

- Look! It’s raining again.  -- Why _________it rain on Sundays? We are always staying inside! What a nuisance!.

It is recommended that the project ________ not be started until all the preparations have been made.