While Helen _____ along the river after supper, she ____ a wallet lying on the roadside.
A. was walking; was finding
B. walked; found
B. walked; was finding
D. was walking; found
He wants to know tomorrow．（ ）
A．if it rainsB．if it will rain
C．whether will it rainD．if will it rain
When we heard the good news， we couldn't help ． We were so excited．（ ）
A．jumpB．to jumpC．jumpingD．jumped
Cars， buses and bikes stop when traffic lights change to red．（ ）
A．mayB．needC．canD．must
These machines cut grass．（ ）
A．are used to．B．use to
C．are used forD．use for
Do you know the boy is drawing a picture over there？（ ）
A．whomB．whatC．whoseD．who