现在进行时构成be+doing — 英语词汇题
题目
用所给动词的适当形式填空（注意-ing形式的构成规则）。1. Look! Mum is c______（cook）dinner in the kitchen. 2. My brother is w______（write）an email now. 3. The boys are s______（swim）in the pool. 4. Listen! She is s______（sing）an English song. 5. We are m______（make）a model plane.