—You are late again，Tom?
—Sorry，but I got ________a heavy traffic jam.
| A．caught in | B．taken in | C．put off | D．held by |
_________ you may have, you should gather your courage to face the challenge.
| A．However a serious problem | B．What a serious problem |
| C．However serious a problem | D．What serious a problem |
He made another wonderful discovery, _______ of great importance to science.
| A．which I think | B．which I think it | C．which I think is | D．I think which is |
These kinds of shoes ________ well.
| A．were not sold | B．won't be sold | C．are not sold | D．don't sell |
In April, 2009, President Hu inspected the warships in Qingdao, ________ the 60th anniversary of the founding of the PLA Navy.
| A．marking | B．marked | C．having marked | D．being marked |
He is constantly ________ not to do that, but he still goes on doing it all the same.
| A．telling | B．being told | C．told | D．to tell |