The old scientist used to say that knowledge ______ from practice．
A．was comingB．comes
C．had comeD．would come
A person _____e-mail account is full won’t be able to send or receive any e-mails．
A．whoB．whom
C．whoseD．whoever
In the last few years, China ____ great achievements in environmental protection．
A．has madeB．had made
C．was makingD．is making
_____ the early flight, we ordered a taxi in advance and got up early．
A．CatchingB．Caught
C．CatchD．To catch
It is the third time that she has won the race, ______ has surprised us all．
A．thatB．whereC．whichD．what
Sit down, Emma．You will only make yourself more tired,________on your feet．
A．to keepB．keeping
C．having keptD．to have kept
