By _____, water can be changed into gas.
| A．heating | B．being heated | C．having heated | D．heated |
—You seem familiar with Mr. John?
—Of course, we________ together for three years in the 1990s.
have worked B. had workedC. are working D. worked
As a girl, it’s important to know what colours look good___________your skin.
| A．opposite | B．on | C．against | D．above |
—We're going for a picnic next Sunday, and I'd like you to join us.
—____________！I have to see my grandmother. She has been
ill for two weeks.
| A．What a pity | B．Good luck | C．That’s all right | D．Go ahead |
_____________grades you get in this exam, you should never lose heart.
| A．No matter how | B．What | C．No matter what | D．Which |
There are lots of problems in your hometown, but we're happy to see many of them___________.
| A．are solving | B．are solved | C．have solved | D．are being solved |