20. The reason ________ many people like the film Not One Less is ________ most of the people in the film use their real names and play themselves.
29. I can hardly remember any occasions _______ I get caught in a traffic jam in our town.
28. —Where have you been all day? —I _______ some former classmates and I couldn’t get back until it was dark.
27. The process of producing electricity may also give out CO2, _______ you heat your house with electricity instead of charcoal.
26. —How much of the foreign expert’s speech have you understood? —Next to nothing. I wish I _______ harder at English.
25. Don’t refer to the dictionary every time you come across a new word as sometimes its meaning may be _______ clearly in a given context.