It was in the lab______ was taken charge of by Professor Zhang ____ they did the experiment.
The students _____ £50 a year to cover the cost of books and stationery.
She was so angry and spoke so fast that none of us understood _______ he said meant.
. I forget where I read the article, or I _____ it to you now.
The man you referred to _____ just now.
On Sundays there were a lot of children playing in the park, _______ parents were sitting together joking.