________ doing his experiment, he forgot to pick up his wife from the station.
29. ______ in the sports world, a sportsman needs to train constantly to keep himself in best condition.
28. Listen, Mike. She_________have done it. She’s been with me at the shop all day.
27. ––Do you want to go to the cinema tonight?––Sorry, I’m so tired. I an early night.
26. With age, the mineral content of human bones decreases, ______ them more fragile.
25. Let’s go a little faster, _________we’ll never get there on time.