With the development of science and technology, there is no doubt________Chinese astronauts will land on the moon in the near future. [ ]

Will books be on paper in 100 years—_______. They will be computers.

Would you like to go to see the film withus–Sorry, I can’t. Because I ________ ittwice.

The box is________ heavy________ the little boy can’t move it.

Having a trip abroad is certainly good for the old couple, but it remains_________ whether they will enjoy it.