An advertisement is useful in ________ it lets customers know of the kinds of goods in the shops.
| A．that | B．which | C．what | D．whether |
Here are some new computer programs _____ for home buildings．
| A．designing | B．design | C．to design | D．designed |
sweet and fresh, this kind of food is so popular with local people and the tourists．
| A．Smell | B．Smelling | C．To smell | D．Smelt |
Always read the label ______ you wash your clothes．
| A．before | B．unless | C．since | D．until |
—Flight 331 _____．I'd better be on my way．Goodbye．
—Bye．Happy landing!
| A．is announced | B．is being announced |
| C．is announcing | D．has announced |
To appreciate that it's not easy for you, but you ______ try to get here on time．
| A．may | B．must | C．will | D．can |