22. _____ computer has been proved to be _____ important aid in classroom teaching.
The train was to arrive at 11. 30, but it was an hour late.
–---Where does Mr. Smith live?------He has been in London he end of the war.A by B. at C. in D. since
-----Did you find the missing couple in the mountain yesterday?-------No, but we _ to get in touch with them ever since.A have tried B. had tried C. have been trying D. had been trying
--- Do you think a child should follow _______his parents say?--- That depends.
Take care of yourself! You can leave the hospital when you have completely _______from your illness.