It is believed that a new kind of drug ______ by the scientists and they are hopeful that they will succeed in a few months

haven’t heard from Henry for a long time.—What do you suppose____ to him?

.—_____ you _____ your homework yet—Yes, I _____ it ten minutes ago.

Excuse me, could you tell me _____—Certainly. At a quarter past two in the afternoon.

Because of the map, theman didn’t have any _____ finding the way to the hotel.