Solar energy is considered as one kind of................ fuels.
A.alternative
B.various
C.replacing
D.changing

Applicants for government posts are always thoroughly ..............before being admitted.
A.supported
B.trained
C.investigated
D.helped

Someone must have taken my bag. I clearly remember................. helped it by the window and now it has gone.
A.leaving
B.leave
C.to have left
D.to leave

Mr. Brown................ for 10 years when he finally gave it up.
A.had been smoking
B.has been smoking
C.had smoked
D.has smoked

............... they might be hungry. I offered them something to eat.
A.To feel
B.Felt
C.Feeling
D.Having felt

The sun is shining and there are very few clouds; ................. , I am sure it is going to rain.
A.hence
B.nevertheless
C.what's more
D.thus

Dangerous chemicals can be ............. from burning plastics or hairspray containers.
A.freed
B.invented
C.released
D.escaped

Many factories have to...................... old newspapers by new methods.
A.print
B.process
C.recycle
D.make

Would Tim be angry if I ............... his bicycle without asking?
A.had taken
B.would take
C.took
D.take

Peter won $20.000, half of............. he gave to the local orphanage.
A.it
B.which
C.whom
D.that