Who helped Li Lei with his English — , he learnt it by himself.

It is not immediately clear __________ the housing price will go down

The professor, _____ some of his assistants, _____ to attend our discussion this afternoon

________in Paris for five years, but still can’t read and write in French.[ ]

g in space_________sound easy, yet great care and skills are required.A.mayB.shallC.should D.must