___ warmly for his work, he was too ___ to fall asleep.
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.
24. The Expo site should be _______ from anywhere in the city of Shanghai within 90 minutes by bus, subways and special taxis.