Flowers suddenly burst out everywhere on the same day every spring, as if they in tune with one another.
| A．are | B．were | C．have been | D．are to be |
He went from door to door, _______ waste papers and magazines.
| A．gathering | B．gathered | C．gather | D．being gathered |
. _______ the office, the foreign visitors were shown round the teaching building.
| A．Having shown | B．Showing | C．Has shown | D．Having been shown |
With winter _______ on, it's time to buy warm clothes.
| A．came | B．comes | C．come | D．coming |
Deeply _______, I thanked her again and again.
| A．being moving | B．moved | C．moving | D．to be moved |
_______ how to do the homework, I went to ask my teacher for help.
| A．Not to know | B．Not knowing | C．Knowing not | D．Not known |